Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7bed775b2e36685…

MALICIOUS

PDF

74.8 KB Created: 2021-03-11 06:04:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 428bd13092d851ea20d400c8ec6e5e61 SHA-1: f752a531aa8b1b74f2b67c5137c8e2bba9324a02 SHA-256: d7bed775b2e36685ae151a7825afef4ded5a37e826312a8cb3ff2c4822d731d3
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document's content, though obfuscated, appears to be a lure related to job applications, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/123?utm_term=accountant+job+cover+letter+template PDF link annotation
    • https://tuvitewolejuxow.weebly.com/uploads/1/3/4/6/134615754/pabatixid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414353/normal_6013d9114bb5c.pdfIn PDF document text
    • https://dananiruw.weebly.com/uploads/1/3/2/7/132741593/1361628.pdfIn PDF document text
    • http://pollsexpert.com/40_hadith_nawawin48bw.pdfIn PDF document text
    • http://lofitner.buzz/83792592621un6cp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469643/normal_60253c208ddf7.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/fevezu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_6a61414fafb24838a2e10dac568493a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/41095a5f-4d42-48f5-902a-3826f1ae1fe7/how_to_apply_gentle_leader_collar.pdfIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_92592ad73aa24f2d855236a8f5f61700.pdf?index=trueIn PDF document text
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_40c04aa395b044689c964c9a60c85cee.pdf?index=trueIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_8a1f48b2cc5646f08d75354e3fb78ad9.pdf?index=trueIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_a742e48629cc46f4a3896a413f98f072.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ae6b72-1513-45a8-85c6-892ed340869e/sowenifabiwurowomewemakus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21fbe8cc-e181-4d8e-bdb9-728962e9911a/23626643062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ec1cfaf-c58d-4dfc-ace3-e141770634fb/rich_dad_poor_dad_download_mp3.pdfIn PDF document text
    • http://manosotidokef.myartsonline.com/what_is_keto_diet_for_indian_vegetarians.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_off0000e8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D6 5164 bytes
SHA-256: af155aa1ab7b657c10e534f2e219572aff248b096570d25e76241e56d0dd63de
font_01_sfnt_off0000fa5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 10420 bytes
SHA-256: 67a48744ef642c92689be2b1d910d6f6e7f0eaeb486e936c35972eaf80802153

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