Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1a60165243cee1…

MALICIOUS

PDF

80.6 KB Created: 2021-05-16 23:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01ca9521e05701e4fa0ac2443ab7aa56 SHA-1: a61c2a6ed8898f7d29c2fe8c2acf140292f89632 SHA-256: 7a1a60165243cee1bdcaf251d1dc8a986448975aeafe801c08220d080721303d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attack pattern involving directing users to potentially malicious content hosted on external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=taco+bell+steak+burrito+supreme+nutrition
    • http://ourfanz.com/35752370623wxrhn.pdf
    • http://cashbackmoney.info/28265193830tsf8d.pdf
    • https://cdn.sqhk.co/feziwetesene/gcLSqda/83417589431.pdf
    • https://cdn.sqhk.co/jemajujo/cahizih/xezifelumaxawe.pdf
    • https://zipuboxovasabe.weebly.com/uploads/1/3/1/4/131483293/75431d.pdf
    • https://cdn.sqhk.co/wowixepis/iP48QUc/vedunurovof.pdf
    • http://update-win20.online/36777276132p1o1w.pdf
    • https://cdn.sqhk.co/fujotojaxob/bEpogeu/amazing_breaker_level_64.pdf
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/1298050.pdf
    • https://cdn.sqhk.co/lojosexotak/gijcHPD/free_gems_clash_of_clans_no_human_verification.pdf
    • http://new-leggins.site/pokemon_ultra_sun_and_moon_nintendo_switch_release_datep7t79.pdf
    • https://cdn.sqhk.co/wamitavixitu/niizgc8/6777678713.pdf
    • https://cdn.sqhk.co/mofekuma/jtuRLgj/dovatupavujefexixadaki.pdf
    • https://tadadali.weebly.com/uploads/1/3/4/0/134095934/xafufisexotapuvimi.pdf
    • https://fokokawozele.weebly.com/uploads/1/3/4/8/134888355/5414387.pdf
    • http://auth02mobility.com/nefibenuji1x6c8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mikibetiv/age_calculator_apps_free.pdf
    • https://s3.amazonaws.com/bodajaku/admin_dashboard_template_without_sidebar.pdf
    • https://s3.amazonaws.com/wetevali/cambridge_igcse_chemistry_workbook_4th_edition_answers.pdf
    • https://s3.amazonaws.com/divelikubapiwaj/assassin_s_creed_origins_hidden_trophy_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9e7.bin
57783f3e320ef656df31e4660f897040eec4175230f86b2e82040c113d149b68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E7 5232 bytes
font_01_sfnt_off00010b99.bin
266168791524a896dc481e67b868e1e9a245f0273c909ef6f403e80e8e3ea38f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B99 12200 bytes

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