Malicious PDF — malware analysis report

Static analysis result for SHA-256 afbcf14535b54740…

MALICIOUS

PDF

79.5 KB Created: 2021-03-22 03:05:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d242f15638d97458e59be926a524c6f0 SHA-1: c926660177ecba6db430f0d0a63bad8a6eb27c60 SHA-256: afbcf14535b547403a12ebdb76604b4ca03428d9be2d48100020a34297a723c6
244 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which point to disposable hosting or known redirectors, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=granddaughter+in+spanish+google+translate In PDF document text
    • https://cdn-cms.f-static.net/uploads/4459787/normal_6016ce2fe2a41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427781/normal_5fcd437f6118f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386848/normal_5fe401519aa51.pdfIn PDF document text
    • https://cdn.sqhk.co/dagidomu/UjijenU/chamma_chamma_new_song_mr_jatt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376852/normal_602f25d797408.pdfIn PDF document text
    • https://cdn.sqhk.co/nitunoda/ghRhiia/drift_max_pro_dinheiro_infinito_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/sirijunubi/fp0KwcS/tinavisonikevisiwovavatex.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/gdjbihi/nopafazogagozozixuw.pdfIn PDF document text
    • https://cdn.sqhk.co/vameduvide/ighOSib/jolasoropi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426062/normal_5ffa1c8e4de37.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_9c981ec25cef4471bef3aa4a8b607478.pdf?index=trueIn PDF document text
    • http://zenoridofagokev.epizy.com/fezibazanerukofe.pdfIn PDF document text
    • http://tumunem.epizy.com/calories_in_dominos_small_cheese_burst_pizza.pdfIn PDF document text
    • http://rovututuxopi.epizy.com/jirevopujesisokinezuvu.pdfIn PDF document text
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_a160e8f7cd204fa1a34f3babce3e1680.pdf?index=trueIn PDF document text
    • http://pikididubemet.epizy.com/coleman_roadtrip_285_portable_stand-up_propane_grill_review.pdfIn PDF document text
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_ed675df382aa48a1b5ccea97df0ece63.pdf?index=trueIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_32b1529c38a24a2b8a2639276fb12d9e.pdf?index=trueIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_281efb7a920242328ad89c8a676bde0d.pdf?index=trueIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_1fb31cd69fc2486cbdf502ccdbd013a4.pdf?index=trueIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_7e8d6f8ded8a4f3f83643ce1d887bd7e.pdf?index=trueIn PDF document text
    • http://zewipurorafe.epizy.com/74226324573.pdfIn PDF document text
    • https://804b95bc-9ca4-448d-a094-5a8e1ff69a26.filesusr.com/ugd/99d1da_94b5c95abfe74ba4a3da0e6e05387edf.pdf?index=trueIn PDF document text
    • http://tasokapivodi.epizy.com/gogelefidubatakumew.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_off0000fa2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 5252 bytes
SHA-256: 033190924800e54268dcd18dc5b4c60fed8978345c2f1fde30caf7f88df85fc6
font_01_sfnt_off00010c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C04 10832 bytes
SHA-256: 6b1247d245073ed8d1576caa3398d973336d519f7c522e92a6a41b2beffe3377