Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1c76aa7e6c141f…

MALICIOUS

PDF

88.6 KB Created: 2021-03-23 22:46:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 62a16fc51be73eb0e6d5875d538ec775 SHA-1: 698bdedeff767d64d1b58db11cf9ff372a417e7f SHA-256: 1b1c76aa7e6c141f6aade0f09394176bbe8949b82fa96928821ba2ac97dba234
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm designed to distribute traffic to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/123?utm_term=cisco+ap+3802i+datasheet In PDF document text
    • https://muwewixobajigu.weebly.com/uploads/1/3/4/3/134312624/61f3eb832f12ef3.pdfIn PDF document text
    • https://cdn.sqhk.co/nojebimit/hgfggih/shark_ion_f80_canadian_tire.pdfIn PDF document text
    • https://gudifikopar.weebly.com/uploads/1/3/4/6/134627505/sokajo.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxaguzifep/ejgicid/spinal_cord_diagram_with_nerves.pdfIn PDF document text
    • http://zuvels.xyz/how_did_dolores_cannon_really_diezzoii.pdfIn PDF document text
    • https://cdn.sqhk.co/wozulifudon/k1hjFCs/bibliography_mla_format_generator.pdfIn PDF document text
    • http://raisinsapp.club/t_fal_pressure_cooker_canadaua0r4.pdfIn PDF document text
    • https://fezowekufeda.weebly.com/uploads/1/3/3/9/133999429/tofororajogore_botozopivab.pdfIn PDF document text
    • http://7lessons.site/affinity_photo_manualzk63u.pdfIn PDF document text
    • https://tupodawemizaz.weebly.com/uploads/1/3/4/5/134594588/b6a2db.pdfIn PDF document text
    • https://lezaxuvetevomuf.weebly.com/uploads/1/3/4/3/134370754/zevajoguxafunodok.pdfIn PDF document text
    • https://zesoxomilojul.weebly.com/uploads/1/3/4/0/134018604/d885f8edc060d.pdfIn PDF document text
    • http://itali-big.space/91561659124mfpco.pdfIn PDF document text
    • https://cdn.sqhk.co/tawavumazo/ihjfVkV/48394366736.pdfIn PDF document text
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/jixewabow-nuxunetejuz-figuxamusunogo-gasisatogivul.pdfIn PDF document text
    • https://cdn.sqhk.co/junizafuzep/IPyhahb/very_loud_phone_ringtone_free_download.pdfIn PDF document text
    • https://posolefuriw.weebly.com/uploads/1/3/4/3/134374222/2226257.pdfIn PDF document text
    • https://ridixuzo.weebly.com/uploads/1/3/4/6/134605053/1380756.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_c0304fa774b04da1b12f865c42aa0119.pdf?index=trueIn PDF document text
    • http://lowevuribif.epizy.com/alimentacion_sana_recetas_inteligentes.pdfIn PDF document text
    • http://selosaxugi.epizy.com/chair_images_pics.pdfIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_9596e53de187407a860fa2c4d021e785.pdf?index=trueIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_ac89a550c3a348379df98db3d7584764.pdf?index=trueIn PDF document text
    • http://diwiludoki.rf.gd/free_gre_test_prep_books.pdfIn PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_ec33198fe74d4fe8adec024cac0087e0.pdf?index=trueIn PDF document text
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_a287930dd2a94a399d569bb92b0eea3f.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E9 5568 bytes
SHA-256: 54d97f0d0477a88ca5b156cae41066143d764f60b2a78f02b02f98baf2bec47a
font_01_sfnt_off000109cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CD 20308 bytes
SHA-256: 7a09ab36b6450826455e925ec1e1045a574518e69884abe1dfad59fa83535a1b
font_02_sfnt_off00013b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B14 17680 bytes
SHA-256: f66632f9bf46d735fdd382343cd14ca45b315433a7fd37ffbf9e98192b9087d0