Malicious PDF — malware analysis report

Static analysis result for SHA-256 6715292a06564324…

MALICIOUS

PDF

77.0 KB Created: 2021-04-02 04:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11de74493e10949db3018af5d04908aa SHA-1: 7be39df65c00b65c18323e07d35eb0f304925a93 SHA-256: 6715292a06564324e3c817054ea0a721b406fe27671d2f9bef9672f12c148c5a
156 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 of which point to other PDF files, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://zajinet.ru/strik?utm_term=what+to+write+in+my+nephew%2527s+birthday+card
    • https://cdn.sqhk.co/tavanaru/jhZSypU/muduvuvutufedojirolumim.pdf
    • https://salovunuwav.weebly.com/uploads/1/3/0/9/130969923/rokivi.pdf
    • https://cdn.sqhk.co/zebenane/higdieq/tizodonesunidogakelireses.pdf
    • https://cdn.sqhk.co/nomuzali/ahgmjf8/tadukuseroledosusibof.pdf
    • https://zazuxari.weebly.com/uploads/1/3/4/3/134319397/1d71f33beea9.pdf
    • https://cdn.sqhk.co/gatuwaven/gcgfIhg/61995295723.pdf
    • https://cdn-cms.f-static.net/uploads/4495387/normal_5fe6c41454caf.pdf
    • http://begimewabifax.getenjoyment.net/agricultural_engineering.pdf
    • https://cdn.sqhk.co/kexofodatop/hfOhiT7/80873932120.pdf
    • https://xajakubadom.weebly.com/uploads/1/3/0/8/130874473/8069551.pdf
    • http://supariwepexafat.mywebcommunity.org/how_is_social_learning_theory_used_in_social_work.pdf
    • https://cdn.sqhk.co/vapitinab/jDjjTFP/tangled_soundtrack_playlist.pdf
    • https://cdn.sqhk.co/kiraxozi/f9if763/torovamovidijixiked.pdf
    • https://cdn.sqhk.co/seseniluvus/jn7QHdf/hexion_inc_locations.pdf
    • https://cdn-cms.f-static.net/uploads/4413590/normal_60120970c3639.pdf
    • https://cdn-cms.f-static.net/uploads/4482228/normal_602d47bfbfe3b.pdf
    • https://static.s123-cdn-static.com/uploads/4380536/normal_5fde64f4cde7d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_d3f892d960df4e1c8f1aba1eb70c7301.pdf?index=true
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_ee904a573e8348ee9afacb9730d38dbd.pdf?index=true
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_5baa2f88804b4b079b3791867e852cc3.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_off0000eee2.bin
d6f1bd9199c36b03ee045d7b359f0df66795a42d754b6157aa98af0d5dcaf043		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE2 5664 bytes
font_01_sfnt_off00010216.bin
ed3f0d8060a4c91cf9afc2fd9c62961b80923bec22eab7cd9afb6d2795666404		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10216 10648 bytes

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