Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc8f5d3f4486f68…

MALICIOUS

PDF

87.5 KB Created: 2021-04-29 17:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 44956495e959ffb436b1bdd60829c9de SHA-1: 74d08a24c9e533ca4baeb1c80372c2ee8ddd6f81 SHA-256: afc8f5d3f4486f68837672cc041a76adf79d7ebb534c9c617b8c6795093e3be1
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://midufefew.ru/strik?utm_term=best+free+wordpress+hosting+sites PDF link annotation
    • http://slimitalia.space/limefuperudapepuwobenipem6gz7.pdfIn PDF document text
    • https://puduwuxibipufu.weebly.com/uploads/1/3/5/9/135966859/7455730.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/cgdRCAt/get_your_guide_support_email.pdfIn PDF document text
    • https://wafodefa.weebly.com/uploads/1/3/4/4/134480145/1870151.pdfIn PDF document text
    • https://cdn.sqhk.co/puzonexus/ujfji1o/gonomexekudokuruvined.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/yYxggKI/44088275946.pdfIn PDF document text
    • https://cdn.sqhk.co/rosavuzezig/iShehjV/iowa_80_truck_stop_barber_shop.pdfIn PDF document text
    • https://sezunugavekavo.weebly.com/uploads/1/3/5/3/135321765/541284.pdfIn PDF document text
    • https://cdn.sqhk.co/libewepigux/bEhdWih/heritage_auctions_europe_comics.pdfIn PDF document text
    • http://kulinar2020.site/bob_proctor_you_were_born_rich_workbiuhtp.pdfIn PDF document text
    • https://cdn.sqhk.co/silinetufid/ehbUhdO/90347058722.pdfIn PDF document text
    • http://ampinternational.org/69388139620b6br2.pdfIn PDF document text
    • https://cdn.sqhk.co/zodunoxurob/cOFgdie/4826605038.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/lhbYhiI/space_force_season_2_renewal.pdfIn PDF document text
    • http://pravagims.net/zajukamofefvheh.pdfIn PDF document text
    • https://bugekawimilu.weebly.com/uploads/1/3/4/5/134589579/4029848.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/jc0ijja/sutifolunorugamuvovunofu.pdfIn PDF document text
    • http://sweetmeet.online/why_is_mercutio_queen_mab_speech_importantuil79.pdfIn PDF document text
    • https://cdn.sqhk.co/goremujoz/pjjidje/58823225823.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/piwanisaj/pazisubupukena.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/gubomotetulokavakovuzix.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/bebo_bebo_song_mr_jatt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0834340c-2d14-4463-9a08-75cfd1e56a03/adobe_premiere_pro_cc_2016_requirements.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/82789731769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75c10ec7-d1f8-4235-ada1-0a157cf63206/nedewuzovolefafabuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/452514ee-4714-447b-99f6-a2888122d9e9/price_jhangiani__chiang._2015._research_methods_in_psychology_second_canadian_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f56e4a9a-4adb-40d8-b9d8-4580352fc74b/new_american_bible_revised_edition_nabre_online.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/kuxel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001096e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096E 4992 bytes
SHA-256: e5fba8f84ad2852110d3375490f85a76e368e858735bdb0dabc3c559e32e4946
font_01_sfnt_off00011a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A74 11484 bytes
SHA-256: 70a5347d82469b197387e0159c0ea10c2c4ebb432afb0da80dcdd9223e7b363d
font_02_sfnt_off000141a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A5 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e