Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c641450a665d040…

MALICIOUS

PDF

75.2 KB Created: 2021-03-14 14:42:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1d5e96a2208b136b3703f9479c229f71 SHA-1: 96e83d20fcf16ee3a09a6a10cb0fd1eed4c5377e SHA-256: 9c641450a665d040fcfbfe738b4d55701c8087efd6ba98d1c5acd6a807602ddb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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 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://pelibifir.ru/123?utm_term=blue+green+white+background+free PDF link annotation
    • https://cdn.sqhk.co/duputokodoz/iiiiihc/top_design_blogs_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411935/normal_5fe78b2541d4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_602e51e860e54.pdfIn PDF document text
    • http://vizit.store/vipivikimazogulujabevorcrd1.pdfIn PDF document text
    • http://twenty-promo2020.ru/analyzing_data_worksheet_chemistrybkx1v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408976/normal_5fd63d0d61474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372983/normal_601c86189f32b.pdfIn PDF document text
    • https://cdn.sqhk.co/lexoxuxoluvi/dmUahcA/tofitedotibov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pumonufagatoteb.epizy.com/hl7_cda_implementation_guide.pdfIn PDF document text
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_45e7e369c1104f77ac6d155cf73653cd.pdf?index=trueIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_de118965287246a4b339ee84e7ca9c7d.pdf?index=trueIn PDF document text
    • https://cbf60184-924b-4e65-abc2-244eb733ec12.filesusr.com/ugd/9a25f9_366950f2000c4ba684213dcfdcedb342.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0204bd70-be96-4bf0-9292-3548ae4c4641/tetaloda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92d6d7ad-e2dd-45da-a307-6910556a057f/safety_instructions_for_visitors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee86fb5c-c8f2-48c7-8e7d-01368105a163/brawl_rules_magic_the_gathering.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6099045-315a-4f12-aa21-a0bc1d4bf551/11231228637.pdfIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_6cc7760d309c45f4872f63722cbaaede.pdf?index=trueIn PDF document text
    • http://xibobok.rf.gd/christopher_watts_discovery_report.pdfIn PDF document text
    • http://genapixej.epizy.com/zafurikuke.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_off0000e745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE745 5448 bytes
SHA-256: df531e057b1385da7978de650684a6062443ed964f4780b2d56097c5cbd8de96
font_01_sfnt_off0000f9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E0 11116 bytes
SHA-256: 2236ba634e87b27f307d372935d752308f5c4614e58b63be63b3b52078c75b6c

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