Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c470c8a45776e54…

MALICIOUS

PDF

61.4 KB Created: 2020-11-12 20:47:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3e7345cde19781b8ac816ade475dee12 SHA-1: d7a95dd6c8a4b8f88e9e6070bfb1af8ea29afb4d SHA-256: 4c470c8a45776e54f1204f0474f052b78802eca511a71fef2946e64bb02c10a4
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/strik?utm_term=ginni+beard+photography PDF link annotation
    • https://lebotuzipum.weebly.com/uploads/1/3/4/5/134519329/tasuk-pofagudopi.pdfIn PDF document text
    • https://tewavifoma.weebly.com/uploads/1/3/4/4/134482239/6196971.pdfIn PDF document text
    • https://pinonomobeberex.weebly.com/uploads/1/3/4/3/134318871/b9c8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457006/normal_5fa0ae1b76a21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404966/normal_5f9e50c75cce8.pdfIn PDF document text
    • https://fedijukesubi.weebly.com/uploads/1/3/4/6/134600597/losuruxomez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409114/normal_5f962f6547b61.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/7989682.pdfIn PDF document text
    • https://luvepuxoworusoj.weebly.com/uploads/1/3/4/6/134660421/kodinukiwekijobafis.pdfIn PDF document text
    • https://wavutokemik.weebly.com/uploads/1/3/4/3/134309613/8693400.pdfIn PDF document text
    • https://nipokilalupa.weebly.com/uploads/1/3/4/4/134485501/888931.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb2aa80b-2794-4cd7-801b-d921c186aad0/intelligent_investor_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/900298c2-6835-4858-8abb-fcabe3a232ce/solar_electricity_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c99b4867-7831-4b03-b074-e3b65bba5a1e/rca_rtb10223_manual.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_off0000b2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E4 5284 bytes
SHA-256: e47eccf389e5b5d3eca4b1206043fe7cb3e0f69439ebeb18effd6872af6c337d
font_01_sfnt_off0000c4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DC 10504 bytes
SHA-256: 08f61d8ead3e6c93341189799a491d832345c178cd26c96d7a0724f676b0c6de

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