Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3d68e4539369d7…

MALICIOUS

PDF

72.7 KB Created: 2021-04-27 21:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24c4b584929b64c4b402ff9beeeb7719 SHA-1: 9bb0b524766a49594032d6b39135917695fdddaf SHA-256: 1a3d68e4539369d77ef28a4ab9dac526fee278092f88c4343760edf38cd70568
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The embedded content appears to be a search query, further supporting the lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=where+can+i+buy+the+dice+game+left+right+center
    • http://lirelejavebot.iblogger.org/ceo_bihar_voter_list_2017.pdf
    • https://cdn.sqhk.co/pijajawopoji/Fhd3pwQ/pujikipumab.pdf
    • https://cdn.sqhk.co/sipebesoxu/CbT1ghp/everfi_module_5_credit_scores_answers.pdf
    • https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/2419880.pdf
    • https://mazanotofubemiz.weebly.com/uploads/1/3/2/6/132681192/3822121.pdf
    • https://cdn.sqhk.co/tevotapomow/P9gf9gf/zejutepimejeja.pdf
    • https://tiruvodeg.weebly.com/uploads/1/3/4/8/134892329/vomivotijujop.pdf
    • https://zosupexaduj.weebly.com/uploads/1/3/0/7/130738593/3269c9d.pdf
    • http://tumugake.iblogger.org/dokisaxidideg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_108a9e4cfeb0484686b6efbc1e0a0d74.pdf?index=true
    • http://faligesiba.rf.gd/surah_yaseen_full_alkalam.pdf
    • https://4c80ca50-31de-4e6f-b265-471620011c4a.filesusr.com/ugd/08c6b7_cd0de3300f1048adadccbe46e19783ab.pdf?index=true
    • http://rotaduwifomol.rf.gd/target_sheets_full_bed.pdf
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_b2494a1aa57e4f7694326927a592368e.pdf?index=true
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_658ad046ebe244bea9152db7fbae099b.pdf?index=true
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_7c91958e81444386ae331a4760fc3dff.pdf?index=true
    • http://junopufobapepax.rf.gd/xuvupusalofuxefatunujobit.pdf
    • https://7980b0ff-2efe-48f4-a442-6c87bca80713.filesusr.com/ugd/9bd8c3_16904de0c0d643f1a38f5feec1df8ddc.pdf?index=true
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_d866dc550d4c4ae281bc403e52075828.pdf?index=true
    • https://s3.amazonaws.com/temujonuwu/jorawage.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_off0000de94.bin
4da8878262019a67c5a5aa8a616c8cd981c3e37591efca7c4f64af30f2a098fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE94 5512 bytes
font_01_sfnt_off0000f144.bin
d5e2f649cad3d2ee51118c45d9ae4b807cf9112f57cd9f98911bd0721779a49a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 10636 bytes

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