Malicious PDF — malware analysis report

Static analysis result for SHA-256 5845920d75ae79e3…

MALICIOUS

PDF

69.2 KB Created: 2021-01-13 23:05:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6b660921a29233a32ededbc0af9041e3 SHA-1: 6aa4e579c09caa9a2fa11c189ca0197fe16ce3ce SHA-256: 5845920d75ae79e3ea56ca6636dd2f9958db4275cd0d0a98e57040f994dd5991
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous external links to other PDFs hosted on disposable domains. The primary purpose appears to be SEO manipulation or distributing further malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics.

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://trafftec.ru/123?utm_term=samsung+gear+s2+manual+de+usuario PDF link annotation
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/samesuseliju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481158/normal_5fbd899225a85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416510/normal_5fd9a87e341d2.pdfIn PDF document text
    • https://tajadituzutop.weebly.com/uploads/1/3/1/4/131409135/rokipozeduwebakifubi.pdfIn PDF document text
    • https://sapatipiragibo.weebly.com/uploads/1/3/4/7/134708637/foxarefuvebitida.pdfIn PDF document text
    • https://xozukogazi.weebly.com/uploads/1/3/4/3/134371147/xesimusiduzozuzonaxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376382/normal_5ff28795ade67.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/1d1f8ecc085ca.pdfIn PDF document text
    • https://ronupajowosoza.weebly.com/uploads/1/3/4/8/134871490/5764679.pdfIn PDF document text
    • https://kunimagim.weebly.com/uploads/1/3/4/6/134608209/vugesezufunuri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379379/normal_5fbd0bd3251f7.pdfIn PDF document text
    • https://site-1176387.mozfiles.com/files/1176387/pakakerilomiwatinosop.pdfIn PDF document text
    • https://buvowanux.weebly.com/uploads/1/3/4/6/134685119/f6c7f62d93.pdfIn PDF document text
    • https://fuwidomanajano.weebly.com/uploads/1/3/0/8/130874101/29a5aae95e4a05d.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
    • 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_off0000c694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC694 5184 bytes
SHA-256: 09f91b93115f6d2362905513ca8ef8fe884d3747711f824f74bc7bef17753b18
font_01_sfnt_off0000d800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD800 9904 bytes
SHA-256: eb64905138a011f8713a6814f080227bd5e8c7fa349809a4f809c9a076a1aab8
font_02_sfnt_off0000f9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C9 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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