Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf6eeb3f46425ff…

MALICIOUS

PDF

96.1 KB Created: 2021-03-19 05:28:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5e2c00fa98aef3c0925f79f3ea4afafc SHA-1: 686cb38860bb2fa2b07f1f147da9e3719cd8f3e5 SHA-256: fdf6eeb3f46425ff4e6c5e7654d5b555d4b0539026faa697b8b680e91e2694fb
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to other PDF files, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of a 'download' button lure reinforces the malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://xezojetit.ru/wix?keyword=mitosis+worksheet+and+diagram+identification+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418583/normal_6037bbc3b8bb6.pdfIn PDF document text
    • https://valojeruxul.weebly.com/uploads/1/3/4/6/134681631/6939840.pdfIn PDF document text
    • https://joweralifaj.weebly.com/uploads/1/3/4/3/134350132/dimogunuwane_fafezipupoleru_tokal.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/bGidBPF/harvest_moon_neil_young_lyrics_traduction.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494417/normal_5fdb2cee59866.pdfIn PDF document text
    • http://twobigs.space/lg_lfx31945st_07_not_cooling5w9cs.pdfIn PDF document text
    • https://cdn.sqhk.co/kavonalitego/gcjehjf/92090793364.pdfIn PDF document text
    • https://zezowamizafomex.weebly.com/uploads/1/3/1/3/131381240/wigajixovilodibix.pdfIn PDF document text
    • https://cdn.sqhk.co/poxofufiko/IRiegio/rirulenipamazaxatoga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476127/normal_5fd9c2498a39a.pdfIn PDF document text
    • https://sevezumu.weebly.com/uploads/1/3/2/7/132710575/55fda07585f0.pdfIn PDF document text
    • http://stonersfranchise.com/sample_abstract_format_for_project_reportgrl1v.pdfIn PDF document text
    • http://s7hmus.org/bepukokh6i1.pdfIn PDF document text
    • http://meetplafond.xyz/molog41zey.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/rijufikefarozi.pdfIn PDF document text
    • https://ac911ccd-a574-46a9-bbb3-57bb927ff796.filesusr.com/ugd/2735c9_3cd127baa1b44784929e683c00edc7d8.pdf?index=trueIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_c71a4223460f426eadad1c95581b63f7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mutirexa/extended_essay_history_subject_guide.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_1981d6cb6d58439eac779b8d2384804b.pdf?index=trueIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_8ad5b88ec92546d8ab54c87f5f7c527d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/guidepoint_pharmacy_marshall_minnesota.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/it_inventory_checklist_template.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000136ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AE 5700 bytes
SHA-256: 76a5ee3aea71ba86a9a7c3620ceeb31d3135827c019555d3a898e2e168af63e7
font_01_sfnt_off00014a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0C 11460 bytes
SHA-256: 2da0d1f0710cee45c43a29edc451254c035736a984e29ce7cf1de58c36dbf033