Malicious PDF — malware analysis report

Static analysis result for SHA-256 8681401fcce42a73…

MALICIOUS

PDF

73.5 KB Created: 2021-03-19 08:17:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0f08b4baa8d82d19914e831a092b0531 SHA-1: 3cd47ff53fe20fe0572160ae70ec348dedab86e1 SHA-256: 8681401fcce42a7346cc09b83ab18bca2aaa88ace9b191abed5ab27fec728373
186 Risk Score

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. 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 0.9996

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://ponafet.ru/wix?keyword=rsu+73+facebook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447250/normal_5fd91c130b6dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420224/normal_601baac5496a0.pdfIn PDF document text
    • https://gepavemu.weebly.com/uploads/1/3/4/8/134861499/3fabca9ce8d98.pdfIn PDF document text
    • https://zujefimobob.weebly.com/uploads/1/3/1/4/131453463/010a19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482023/normal_602bffcde78ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_60443ccac98e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403534/normal_602c5903cd49d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386595/normal_600140ad5c170.pdfIn PDF document text
    • https://wumupokurura.weebly.com/uploads/1/3/0/7/130776197/jisoxuditipososu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418184/normal_6002377a4a0cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499282/normal_5fc96b0a7ffde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502721/normal_601b632c14f3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_60293d4d28096.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nibimasumexugi.rf.gd/zudomowurobirakigifi.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/program_samsung_tv_remote_for_lg_blu_ray.pdfIn PDF document text
    • http://ritabodaxitex.epizy.com/dalata_hotel_group_annual_report_2018.pdfIn PDF document text
    • http://kerepokomodas.epizy.com/grade_8_math_questions_and_answers.pdfIn PDF document text
    • http://mujunuge.rf.gd/chicago_manual_of_style_newspaper_article.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/modern_calligraphy_practice_sheets_procreate.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/wall_street_journal_cancel_subscription_number.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/coldplay_paradise_lyrics.pdfIn PDF document text
    • http://lejibunigazaxa.epizy.com/mitosis_and_meiosis_online_lab_answer_key.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_off0000e645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE645 5204 bytes
SHA-256: 4edbd50ef79a0268c0cbfb53777f9d660f0ae5bc03544616ecc4da0a0463b60d
font_01_sfnt_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 9704 bytes
SHA-256: fcdd27bae53f15973ccb1c5a8a0e8ba2dd29e6ec09d94831754af9c40a4e13d2