Malicious PDF — malware analysis report

Static analysis result for SHA-256 4062312b8848be68…

MALICIOUS

PDF

82.4 KB Created: 2021-03-20 20:01:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0885cfbf4f561c2337f562eac2342168 SHA-1: 370e97b95e2aeead49b8ebc34eb9f72fc85af78f SHA-256: 4062312b8848be688a6ae9abb1fac9f28c9c6292f4575e69a5c7a0bf7bdfd0fa
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://ponafet.ru/wix?keyword=lexmark+ms310dn+manual+lights PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370304/normal_5fff54568e636.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417312/normal_5ffcb7bbefdc7.pdfIn PDF document text
    • http://okclub.org/613903000519cz9q.pdfIn PDF document text
    • http://workshop-fb.ru/899598433715582a.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/JihD3xz/streamer_life_simulator_steam.pdfIn PDF document text
    • https://goponubinolofuv.weebly.com/uploads/1/3/4/6/134695307/wotatozul.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/Kv4ghiE/mukiriwotinixupud.pdfIn PDF document text
    • https://pisekubil.weebly.com/uploads/1/3/4/3/134322001/juludobigeko.pdfIn PDF document text
    • https://kevujabuguve.weebly.com/uploads/1/3/4/7/134745112/9f97f2121299d9.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/defikegekuxazu_wiwizejetes_ripedud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417207/normal_5ffa76e130598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454965/normal_5fe7a312b6fca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/solonebosop/ionic_compounds_containing_transition_metals_answer_key.pdfIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_76552c5d2c3b40aca5e9c2062f034902.pdf?index=trueIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_74e87123861046329a03905f2781fb7b.pdf?index=trueIn PDF document text
    • https://5ec50ee2-6c76-415b-b731-82d7de26534b.filesusr.com/ugd/826e74_fe0d563373cb4125b84691f8f960c2c6.pdf?index=trueIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_1570a0a15385425d932a7cdb09f3b5ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/fejavizi.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_off000103e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E3 5668 bytes
SHA-256: 8f94b3af61d8b0e622feedfe6fc2ecdc02db587f3b9faec95757eb96cef1cd81
font_01_sfnt_off00011708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11708 10492 bytes
SHA-256: 1899746e561b020a3091a89fb67c5ed847a19e044017971e1ea1e12b60a09b04

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