Malicious PDF — malware analysis report

Static analysis result for SHA-256 c168162486ed21f2…

MALICIOUS

PDF

83.9 KB Created: 2021-05-10 06:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e42093cd432c3a626ffbc7c7351abbcd SHA-1: 1f3cc067bf1a9133de30c735856465373e83d871 SHA-256: c168162486ed21f2132e97ccd41725132478844d16e7bb250b1d6d435dbb8a8a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The embedded URLs point to various domains, some of which are hosted on platforms like Weebly and Epizy, commonly used for distributing malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate an attempt to redirect the user to potentially harmful websites.

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://nipisod.ru/strik?utm_term=can+you+play+video+games+on+chromebook
    • https://bubosetew.weebly.com/uploads/1/3/4/5/134515161/zujunafixuxu_buzasu_bexukiwut.pdf
    • https://mevukufidax.weebly.com/uploads/1/3/1/3/131379039/dofaliminetona_dijatezunimo.pdf
    • https://rosunitekuw.weebly.com/uploads/1/3/1/3/131384708/6323004.pdf
    • https://cdn-cms.f-static.net/uploads/4488092/normal_601bb2f1794c8.pdf
    • http://fuwajigub.iblogger.org/vcruntime140._dll_free_windows_10_64_bit.pdf
    • https://static.s123-cdn-static.com/uploads/4369933/normal_5ffd0d4252165.pdf
    • https://fefokivaz.weebly.com/uploads/1/3/0/7/130776727/2451282.pdf
    • https://cdn-cms.f-static.net/uploads/4383321/normal_604183483eefd.pdf
    • https://rapodiduwegez.weebly.com/uploads/1/3/5/3/135311990/94b4aef0195e.pdf
    • https://bawigadumifop.weebly.com/uploads/1/3/4/4/134494387/soxikanunamuvazig.pdf
    • https://logugutixolug.weebly.com/uploads/1/3/5/3/135393325/jijowugisaju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wetowuzuxit/beborivevajit.pdf
    • https://uploads.strikinglycdn.com/files/ea04a429-c97f-4e7b-b597-f92ad6d6d5c8/shadows_over_bogenhafen_secrets.pdf
    • https://s3.amazonaws.com/xufaxoferugod/digital_fortress_review_and_reaction.pdf
    • http://xojozemuxubiv.epizy.com/59624518383.pdf
    • https://s3.amazonaws.com/dukavunivifa/molejisidetoxedemil.pdf
    • https://s3.amazonaws.com/marimejerebo/pulse_secure_vpn_client.pdf
    • https://uploads.strikinglycdn.com/files/7854ae97-d850-45ea-ac3b-ee37ce13cdcc/sum_of_geometric_sequence_formula_example.pdf
    • 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_off000107d5.bin
63c84426940c842d750e3578f4a266a83b68ae8c4bf477855e980f949b2a0e06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 5756 bytes
font_01_sfnt_off00011b4b.bin
b287a09232a6b43f69c1c122e3d872a757f1fcfa2ba7557a9cddf125b7b50c04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4B 10844 bytes

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