Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbfac10f11840563…

MALICIOUS

PDF

74.7 KB Created: 2021-03-11 02:58:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 190ef5193b0ae3d12ab7822a91dc47e6 SHA-1: 28add9a1d3d034c4dd92164b7afb32aa5d20b0d0 SHA-256: bbfac10f1184056381eed05f49d1d78cab63b61fb28388a46f879dedc637b0d3
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically for brand-impersonation credential phishing. It contains a large number of external links, many hosted on disposable domains, designed to create a link farm. One prominent link impersonates Amazon and redirects through a Weebly URL, likely leading to a phishing page or a malware download. No scripts were extracted, but the PDF structure and link farm indicate a malicious intent to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tesurupijirixu.weebly.com/uploads/1/3/0/8/130813669/2151450.pdf.
  • 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://zajinet.ru/award?keyword=mergers+and+acquisitions+pdf+book PDF link annotation
    • https://tesurupijirixu.weebly.com/uploads/1/3/0/8/130813669/2151450.pdfIn PDF document text
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/laxodojoloj.pdfIn PDF document text
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/kunowojajowakuki.pdfIn PDF document text
    • http://kimokabif.medianewsonline.com/48225794228.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/1168766.pdfIn PDF document text
    • http://faponabon.mygamesonline.org/free_california_residential_lease_agreement_2020.pdfIn PDF document text
    • https://dibufasefeduvit.weebly.com/uploads/1/3/5/9/135975636/2716739.pdfIn PDF document text
    • https://cdn.sqhk.co/fusuwudofal/WjihaII/98866023176.pdfIn PDF document text
    • https://cdn.sqhk.co/fotenulutis/bO56gdv/mastermind_game_show_zambia.pdfIn PDF document text
    • https://zuxosudeti.weebly.com/uploads/1/3/4/3/134359900/b45201ecd2.pdfIn PDF document text
    • http://teatr-art.com/vemol33c0c.pdfIn PDF document text
    • http://reduslim-europa.site/jeep_wrangler_spare_partso9xm1.pdfIn PDF document text
    • http://foyou.store/how_do_i_know_my_jaybirds_are_chargingoh61m.pdfIn PDF document text
    • https://zepiwifolu.weebly.com/uploads/1/3/5/9/135965208/wononukazujet_semajovemut_xifij.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/think_positive_meaning_in_bengali.pdfIn PDF document text
    • https://mukekevujawova.weebly.com/uploads/1/3/0/9/130969498/zomorirexuzunite.pdfIn PDF document text
    • https://cdn.sqhk.co/satukevaguka/gidqijq/best_royal_family_documentary_netflix.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/zalomi/bookkeeping_transactions_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/salibelovakonajurotalow.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/kotor_2_walkthrough_light_side_female.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_off0000e6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EC 5624 bytes
SHA-256: 191e2f05c625ef4aa28d96be54245b88f71130a63830ff5d8ad9a9a9d766f9aa
font_01_sfnt_off0000fa21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 10576 bytes
SHA-256: a1eace00e5463912b8957c2f3fc0eebee713b8c928eed1a0826a7cbd3fbfc50c

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