Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc3dc4e569c23b6…

MALICIOUS

PDF

72.6 KB Created: 2021-05-15 18:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0e9ea552ee665926eae6fff90ffe0c58 SHA-1: 3e4b1ec0132c76714791329a335e7ef6528a4322 SHA-256: afc3dc4e569c23b66f20a25a7e26e1a96430e8e13e9bc86b0bed3fb66702a880
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful sites.

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://pelibifir.ru/strik?utm_term=waterpik+wp-100w+white+ultra+water+flosser+1+each PDF link annotation
    • http://snt-br.ru/jezemuca5lm.pdfIn PDF document text
    • https://jibokogemi.weebly.com/uploads/1/3/4/7/134767321/4b1ab815221c.pdfIn PDF document text
    • https://vuteduwezo.weebly.com/uploads/1/3/4/3/134336695/2554138.pdfIn PDF document text
    • http://ludshop.xyz/geometry_triangle_congruence_worksheetc91ms.pdfIn PDF document text
    • https://fatofexar.weebly.com/uploads/1/3/4/6/134687548/konabawuludok_foniwikewako_wedivubewidefag.pdfIn PDF document text
    • http://vofovadero.22web.org/mipoxajejukakiw.pdfIn PDF document text
    • http://spindlndou.space/starting_strength_routine_reviewcwcod.pdfIn PDF document text
    • http://myirn.icu/nuguputo89fx0.pdfIn PDF document text
    • http://tehnotop.store/vogoxusalomolucd9.pdfIn PDF document text
    • https://rotolakudezi.weebly.com/uploads/1/3/4/0/134041133/5275783.pdfIn PDF document text
    • http://bekunogoxabune.iblogger.org/atm_card_use_video.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumilamufitilu.epizy.com/biochemistry_review.pdfIn PDF document text
    • http://vimonaker.epizy.com/baba_is_you_pc_free.pdfIn PDF document text
    • http://rogidisili.rf.gd/call_of_duty_mobile_latest_apk_obb.pdfIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_e08a1011b9bb40b49cf1b6fd835c4701.pdf?index=trueIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_ed1bcd2a33ce465fbdc124cb97a7f1b8.pdf?index=trueIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_66189b2174f046f28129558128c613af.pdf?index=trueIn PDF document text
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_7233713e4d3241dcb77192c2fadbb703.pdf?index=trueIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_359bb5e883d34a0595852b00d4f9fb57.pdf?index=trueIn 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_off0000d880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD880 5496 bytes
SHA-256: 5129bd216c57376c839d00b1c4c67a661c8896096c66382945c439c293913afd
font_01_sfnt_off0000eb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5C 13156 bytes
SHA-256: 55b81a16a8de7be14e6c3ce8b31c4af44517c08bc24f3518877e24bc3533cdac

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