Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0a66924081d58b…

MALICIOUS

PDF

69.4 KB Created: 2021-03-10 03:51:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5ad3467264402094d2568001e287ad3c SHA-1: a3ff854aea6f9b8a8f5feb88b996eab214b87e4f SHA-256: ac0a66924081d58b05171ba097bac17b21a1a54f2c77925c5664d63b0e45f4af
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful 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
  • 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://jacksth.ru/wb?keyword=2006%20honda%20odyssey%20touring%20radio%20code PDF link annotation
    • https://cdn.sqhk.co/rudugebakivo/cBsQU2N/formula_1_2019_drivers_salaries.pdfIn PDF document text
    • https://gekirexuwiri.weebly.com/uploads/1/3/1/4/131452917/gaweguruludid-mewoku-wekumojimakuw-zizuzut.pdfIn PDF document text
    • https://tugigoboz.weebly.com/uploads/1/3/4/4/134499705/6389391.pdfIn PDF document text
    • https://cdn.sqhk.co/podidiwi/5m3nfQ6/luke_bryan_drink_a_beer_live.pdfIn PDF document text
    • http://fezelegafefuv.mywebcommunity.org/social_cognitive_theory_strengths_and_weaknesses.pdfIn PDF document text
    • https://mugebixivezir.weebly.com/uploads/1/3/1/4/131484268/wudida.pdfIn PDF document text
    • http://juponuziwotaga.mywebcommunity.org/86715338576.pdfIn PDF document text
    • http://farozemirig.scienceontheweb.net/haier_portable_air_conditioner_parts_list.pdfIn PDF document text
    • https://cdn.sqhk.co/pibepufas/gfgegdp/69448260967.pdfIn PDF document text
    • http://waxinexedodupij.22web.org/suxelipavevanetit.pdfIn PDF document text
    • http://nedosako.iblogger.org/does_pua_still_get_the_extra_600.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c87fbcd-a93f-48bd-b8d5-bc06564bf299/nigupunolofuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de79bb64-9e21-43e5-9d5a-a577a369e06d/axial_scx10_ii_rtr.pdfIn PDF document text
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_de3e06bfcc7645a897d3546be42b5983.pdf?index=trueIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_7bfaac42105f4d32bb458845df15a038.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6c863ce-4776-4833-8094-73159b035cb1/66972082449.pdfIn PDF document text
    • http://kugofabafomozo.epizy.com/hfsp_guidelines_for_research_grants.pdfIn PDF document text
    • https://9b321a86-0615-40a7-b684-6dced782f4cc.filesusr.com/ugd/e3cae3_f5fc6cae70134e41bb3dde9430d00faf.pdf?index=trueIn PDF document text
    • http://xowobovu.myartsonline.com/what_are_the_three_genres_of_poetry.pdfIn PDF document text
    • http://nozovov.rf.gd/81948828244.pdfIn PDF document text
    • http://wivaxodi.onlinewebshop.net/guitar_chords_lesson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c83562a-2240-44bd-8fe9-696000e9eba7/94280032138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00a1d06a-982a-4151-876a-6ef75808d30e/tonivejujetisokanimameli.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_off0000d136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD136 5604 bytes
SHA-256: bd0dd2bdbf005c4f80381008fd6b67807342fa402868541279ee14c72aef64e9
font_01_sfnt_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 10444 bytes
SHA-256: fcfb68204dab08381231b3912815d5acff4ac2b5ced5cacc6e46af2680948fbf