Malicious PDF — malware analysis report

Static analysis result for SHA-256 3652fd9e80dba7d9…

MALICIOUS

PDF

76.0 KB Created: 2021-04-05 17:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 685c51aa7b43847cc38a72d8a0d6f24a SHA-1: 0fbd7c63713977fc6645471d98c6f5e47530ab27 SHA-256: 3652fd9e80dba7d94e84f8bfb30e771e46b9db739c3c5afde9dfac127195109f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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/strik?utm_term=fallen+order+star+wars+timeline PDF link annotation
    • https://cdn.sqhk.co/xidatelo/iih5xVv/28754581857.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/64717242431.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415782/normal_6003992d5323f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417526/normal_605090c8d7585.pdfIn PDF document text
    • https://cdn.sqhk.co/zapimafe/hfdjb7g/39350343802.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484806/normal_5fe311c8849d8.pdfIn PDF document text
    • https://cdn.sqhk.co/dikizumi/uXifggl/kingmaker_knife_master_monk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448339/normal_60649eb371beb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410952/normal_6025983c96c26.pdfIn PDF document text
    • http://zakosemej.mypressonline.com/zovijif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469841/normal_5fd1fdad294eb.pdfIn PDF document text
    • https://cdn.sqhk.co/vunebegawiwa/3gcghIv/ink_master_season_8_cast_winner.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489237/normal_600591f99761a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470826/normal_6055eecd77200.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kofezinidabefu.epizy.com/better_call_saul_episode_guide_season_1.pdfIn PDF document text
    • http://zigejuk.epizy.com/lined_notebook_paper_template.pdfIn PDF document text
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_50b47bcdcc61444190364a4b53006a8e.pdf?index=trueIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_c578f66a2fae40fe8833960384b8cce3.pdf?index=trueIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_292c0008c36d4675be488330887619b0.pdf?index=trueIn 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_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 5016 bytes
SHA-256: d9eeba0eeefb54d88e7a5d2312a67a73cab0ee08ca09ca22fda6954c544eef19
font_01_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 10844 bytes
SHA-256: 052f18b5133c0b011618479f739468dbad7c7dd1c2c2b5e14ea42f4760af27cb

Open this report in the interactive analyzer, or submit your own file for analysis.