Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a6702cf91e9cd1…

MALICIOUS

PDF

76.7 KB Created: 2021-05-17 23:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2b3cd480a74baa4f1fa98c59a5e1c4bf SHA-1: 7d8d0f974359db41e29cbf42ac90375e69e11cb1 SHA-256: 28a6702cf91e9cd1fd87e7a235b8339952456d066e447a3ebece175ded88e09e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. It contains numerous external links, including one to 'golowaki.ru', suggesting it's part of a link farm or SEO poisoning scheme to drive traffic to malicious sites. The presence of embedded JavaScript, though not fully analyzed here, is a common method for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://golowaki.ru/strik?utm_term=role+of+nonverbal+communication+in+public+speaking PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501193/normal_5fcf534c8f2ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380214/normal_5ffff404bb7e1.pdfIn PDF document text
    • http://zejised.iblogger.org/lecciones_de_bajada_de_cargas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467576/normal_5fe317bab695a.pdfIn PDF document text
    • https://tivubolo.weebly.com/uploads/1/3/1/8/131857038/67f819584ee49.pdfIn PDF document text
    • http://padeketun.iblogger.org/fabajosivi.pdfIn PDF document text
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/getinideva-gajasa-rojevurunoze.pdfIn PDF document text
    • https://tigasedoxopafu.weebly.com/uploads/1/3/4/7/134707490/3374484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427079/normal_5fe6450921801.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zanatibagewo.rf.gd/neumonia_en_perros.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/37059474362.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/geometry_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/bulava_teri_aaj_meri_galiyan_song.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/what_is_a_formative_and_summative_evaluation.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/wedding_photobook_psd_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/performance_tool_brake_service_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/woxit.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/96756657656.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/jizuzafatijepo.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/ups_changing_uniforms.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/call_blocker_source_code_android.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/2018_polaris_ranger_xp_1000_service_manual.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_off0000ed9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 5608 bytes
SHA-256: abb0a280d838967e1a33f80dc829537f5f6b75fd35ec1e2f64589a2ac24c8383
font_01_sfnt_off000100a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A6 10732 bytes
SHA-256: 9dbc2c118168177eef5cfa133840aa751907b732de4afffa9551a91b1a71ba6a

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