Malicious PDF — malware analysis report

Static analysis result for SHA-256 a767ca2f1fa7f485…

MALICIOUS

PDF

78.6 KB Created: 2020-12-10 16:45:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2fabba21983c9749f6edf29ff9ef1e42 SHA-1: 90e87de74a4ecd2ceab46a428d73b4cf02a4992c SHA-256: a767ca2f1fa7f48525d66b794b66d91966bc59fcb2f9b077477a39162b8daa1a
156 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 0.9997

Heuristics 5

  • 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.
  • 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://trafftec.ru/123?utm_term=shultz+photo+school+grads PDF link annotation
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/zumobewub-xunupewodew-suside.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485718/normal_5fb46d733de05.pdfIn PDF document text
    • https://salabupomisopef.weebly.com/uploads/1/3/4/6/134631393/b182dc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/netinuwa/ac_dc_problem_child_guitar_tab.pdfIn PDF document text
    • https://s3.amazonaws.com/sibenuvokiwuz/b._ed_2019_form_ts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f728c1c2-f42b-4ea6-8949-24ea3e23e269/wuzuf.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/9255209053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b95e0a90-d3d4-4a1f-8048-6ecd7a3e9257/30067224079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd870c3a-333b-4639-a9e6-7a69772f2401/state_of_alabama_legal_age_of_consent.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/10029700441.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/process_flow_chart_template_ppt_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5af9593-c24e-4521-9679-b5a4ea433ed9/10739048430.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D3 5100 bytes
SHA-256: 5a85a7ad2d4e9b1454309efcea57546d82f06da8c7b43301bfda9eff279b8f44
font_01_sfnt_off0000fa38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA38 11044 bytes
SHA-256: 0644c9d70bfcd343e2e4043af8463b1d06b4e1403ffe1142e596c2c2fbab4c1f
font_02_sfnt_off00011ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFA 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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