Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f4f8c6198e917e…

MALICIOUS

PDF

90.7 KB Created: 2021-04-09 02:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9a034aba7d6518ff2e5f7331692e63c5 SHA-1: 4f911a5116ea37093469d57cd2825d82daa8b193 SHA-256: 51f4f8c6198e917e1de871f6670c3bb7fbafd71458bd0a878f7a815de71b2106
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+is+clerical+work+measurement In PDF document text
    • http://rawitotizoxuk.scienceontheweb.net/xetaja.pdfIn PDF document text
    • https://cdn.sqhk.co/supuzeren/XzuOjfB/71907609825.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/86992566823.pdfIn PDF document text
    • http://sejerodetupumil.medianewsonline.com/64633719715.pdfIn PDF document text
    • https://cdn.sqhk.co/jukunobegabe/lgepAha/40434122997.pdfIn PDF document text
    • http://kakolamilasaru.medianewsonline.com/mivikof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480880/normal_602756c66dbef.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/69824506006.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/structural_drawing_for_residential_building.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426413/normal_5febb1543597e.pdfIn PDF document text
    • http://xirijapip.mypressonline.com/45290070780.pdfIn PDF document text
    • http://puwinowelin.medianewsonline.com/careless_whisper_tabs.pdfIn PDF document text
    • http://rejasikega.scienceontheweb.net/36439550030.pdfIn PDF document text
    • http://folugomobok.getenjoyment.net/99192374031.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://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_6795fb9b276741d3ba6736b7cbb3a071.pdf?index=trueIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_9064ecf48b684670be882a7f492bbecf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC3 5092 bytes
SHA-256: cdd93266eb6d0bd64a4134b2d9354e02181a66d609fe8ea53c0642c11192bbc6
font_01_sfnt_off00012bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF8 10496 bytes
SHA-256: d27e8cd2ed4fbbac8a580dfccac2669bbb0b6539bc589e2c4d39df4ce5581929
font_02_sfnt_off00014fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FCD 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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