Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd000e91b0f84d1e…

MALICIOUS

PDF

77.5 KB Created: 2021-04-17 16:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39900d16d0549b1cff9d0a9082dd83c8 SHA-1: e2acc5a6f8419a329eea060f4e581bee9a616372 SHA-256: fd000e91b0f84d1e6bad7c93c4cb49c7f5786b12af4963dacc3b8bed2c795bfc
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=educational+psychology+msc+online
    • https://kujafuzepod.weebly.com/uploads/1/3/1/6/131637430/4136982.pdf
    • https://xaviwemegegel.weebly.com/uploads/1/3/4/8/134859007/mapaziwivitoku.pdf
    • http://libesikume.22web.org/300_best_bread_machine_recipes.pdf
    • http://show-visitor.xyz/why_is_my_craftsman_lawn_mower_not_starting3i5o4.pdf
    • https://pawimugonuri.weebly.com/uploads/1/3/4/8/134882006/ec1af9ec955.pdf
    • https://vujewixijul.weebly.com/uploads/1/3/1/4/131437312/7b4ddb0d4f3be.pdf
    • http://tehnikator.ru/96421736980uwhfl.pdf
    • http://espacecmb.xyz/76792356793kqhxi.pdf
    • https://suvoneretalepa.weebly.com/uploads/1/3/5/2/135299969/fidipub-temasapesopas-fipuwenegiw-bozit.pdf
    • http://vebenuzan.22web.org/reroludo.pdf
    • http://nususolajegak.iblogger.org/cerebrovascular_disease_guidelines_2018.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kexibuxufo.epizy.com/wikugogoxugefani.pdf
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_c1a3c74eb7604a5aaee06ee37d0d3281.pdf?index=true
    • http://kelujatideligo.epizy.com/kirevewo.pdf
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_5791fbe77e9a4967ac693b81cd0d3ec3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6a80e6cb-1ae6-4f16-a75b-80ad8452f09b/85820036023.pdf
    • http://xumametubedax.rf.gd/fetal_circulation_file.pdf
    • http://mewobunodume.rf.gd/kesariya_balam_song.pdf
    • https://uploads.strikinglycdn.com/files/4d0914fc-0e39-4ffb-a167-876fdcaa422a/legend_marie_lu_adaptation_film.pdf
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_f6883afbf3a6424ebedf3d06b7ff79e9.pdf?index=true
    • http://lalowarereguwel.epizy.com/book_review_of_romeo_and_juliet.pdf
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_b115be352c274b6bb37aad27bfb13a94.pdf?index=true
    • http://bajisop.rf.gd/welimudobuza.pdf
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_f6e6350e0a7f4435b379b33e5f92edff.pdf?index=true
    • 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_off0000ef07.bin
6bf0fc12298ac0fe8b20871c35eaed6c6ce50ef3ecf85a2692a5c68a06ebc7d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 5452 bytes
font_01_sfnt_off00010177.bin
bbcdb0bbea59267ddaa224a6a8790fb8f2b70e0513956cf2d89343d3bd1afea8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10177 11520 bytes

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