Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe7bf3b62605efe…

MALICIOUS

PDF

79.6 KB Created: 2021-04-06 18:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 43337622b39542f243bfda0df8d86dc0 SHA-1: ea31eb2dc0cb104f085689010b4e4b8e0b8b5a9e SHA-256: 6fe7bf3b62605efeec6f03bd855cd68ab24d010c74ab26e2af50ab3a866b485a
216 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://rinavupitaf.weebly.com/uploads/1/3/1/1/131164375/ea193a707b10db5.pdf.
  • 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://maypoin.ru/award?keyword=artificial+intelligence+full+tutorial+pdf PDF link annotation
    • https://rinavupitaf.weebly.com/uploads/1/3/1/1/131164375/ea193a707b10db5.pdfIn PDF document text
    • https://bageriwiko.weebly.com/uploads/1/3/2/8/132814239/1886887.pdfIn PDF document text
    • https://nixakozuver.weebly.com/uploads/1/3/4/6/134626944/6839066.pdfIn PDF document text
    • https://xivilikowigonun.weebly.com/uploads/1/3/0/8/130813923/6413934.pdfIn PDF document text
    • https://cdn.sqhk.co/vakujediraw/d4ogf4C/unscramble_words_cheat_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/hh9UYI5/38510907896.pdfIn PDF document text
    • https://cdn.sqhk.co/xamapetarel/jejbIif/dipagenu.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/4e6f9.pdfIn PDF document text
    • https://xuzimelo.weebly.com/uploads/1/3/4/1/134132070/5fe42b1256.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/jiwisigetizoxif/dekofugesenozesoxu.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/bts_wallpaper_hd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/2854777979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f47061d7-339d-49a7-9c10-7bac63b88255/atem_1m_e_production_studio_4k_picture_in_picture.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/short_acknowledgement_for_thesis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6562221-c338-4f2b-952e-ab7254837545/what_does_a_redbud_tree_look_like.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/how_to_setup_sony_str-dn1080.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/preparing_for_marriage_dennis_rainey_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1993d4ed-3b37-46a1-a837-e0e9f0ddbf00/vupufut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efb60bdb-1ba1-434a-8533-f379a9fb8599/will_durant_the_story_of_philosophy.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/63596154377.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/gnar_aram_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/lutugagufowedog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d82ed54-21e4-4149-86c6-548285448457/lutovoraxanevewusulos.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_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 5136 bytes
SHA-256: d16069049b7a70885565390e90f6c92f57af3dd76907deeec23a195ac6ddaaee
font_01_sfnt_off00010ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE3 10468 bytes
SHA-256: bbc6a54b3ea601f7e017e4a2da629699c21590d5f1cb469aa72d24dceab5216a

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