Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cea71a52c5319e0…

MALICIOUS

PDF

71.6 KB Created: 2021-02-11 16:44:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4c50c1a0ddffc4ac7e989714513a0f6d SHA-1: 27a9eaed280ac32782369824865e9fc42619b6b2 SHA-256: 8cea71a52c5319e0faac7bff9051cdcc73768f9233d6623410251b3a4069a4c2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://maypoin.ru/wb?keyword=asme%20bpvc%202019%20pdf PDF link annotation
    • https://cdn.sqhk.co/metexemoraga/ieMjjdp/tizajanago.pdfIn PDF document text
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/nofunofukinofib_susan_sezozetekoto.pdfIn PDF document text
    • https://xuzipitazejaj.weebly.com/uploads/1/3/4/7/134722028/wexulitovojaka-dofugufuvix-rezuvurevupufap-kizugufevusi.pdfIn PDF document text
    • http://fibakigefejep.66ghz.com/employee_relieving_letter_format_in_word.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/NjaabpA/rubber_duck_programming_buy.pdfIn PDF document text
    • https://dunelakanova.weebly.com/uploads/1/3/1/4/131410870/08637cd3df.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/zotavowod_sonodoxor_juwogekula.pdfIn PDF document text
    • https://xaredoluvowa.weebly.com/uploads/1/3/1/8/131871785/8994187.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/SDjhBgc/football_manager_ultra_2020_mod_apk.pdfIn PDF document text
    • https://berisojelo.weebly.com/uploads/1/3/0/8/130874511/be331.pdfIn PDF document text
    • https://kojemugolipoxo.weebly.com/uploads/1/3/4/7/134729864/4021685.pdfIn PDF document text
    • https://falesejus.weebly.com/uploads/1/3/1/4/131483218/fugopuzawero-leravefiwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lilufunom.epizy.com/verbal_ability_questions_with_answers.pdfIn PDF document text
    • http://foweroboxufafuv.epizy.com/semantic_ui_react_dashboard_template.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/bilharzia_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/stalker_online_quest_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/xelarisevatipu.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_off0000cf7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7D 5636 bytes
SHA-256: 27aa8d2784f4ea4a4dbe2c1e4a4270121d68d49576aa2e2cd326e77ca3bf4a79
font_01_sfnt_off0000e2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A2 2408 bytes
SHA-256: c625ec401ee6cc83dfca96881c370d53f0d7cc1656acfe6af800b9ce1bb502b1
font_02_sfnt_off0000ed5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5B 10568 bytes
SHA-256: 6691268463a22b9a137ea39c1befacffc47dbd22afa6079223ced0e995b1e335

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