Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82339a8da0db825…

MALICIOUS

PDF

76.8 KB Created: 2020-11-25 01:21:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0b40e5043c4312977083677b9377136b SHA-1: 9bf1c0990858ffdfb903a96cf1c0a138a3fc3d34 SHA-256: f82339a8da0db8251059dcfd5ab1695bd727d5c8a1434cc6f157488a5197abf9
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://traffine.ru/123?utm_term=kristie+lu+stout+parents PDF link annotation
    • https://lozavogifod.weebly.com/uploads/1/3/4/4/134482976/1420172.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/a54e57.pdfIn PDF document text
    • https://niweduval.weebly.com/uploads/1/3/4/3/134349673/8104054.pdfIn PDF document text
    • https://dinufipaxa.weebly.com/uploads/1/3/4/4/134440308/kedopox.pdfIn PDF document text
    • https://vuketuwanez.weebly.com/uploads/1/3/4/5/134592446/30e982e50016.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/samesuseliju.pdfIn PDF document text
    • https://xozilawowoxov.weebly.com/uploads/1/3/4/7/134704750/ditagaxesebekowoluxa.pdfIn PDF document text
    • https://morutasatosode.weebly.com/uploads/1/3/4/3/134366393/ruseroxododek_meburedufipug_gaxujebipi_tifavegovulewaj.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://uploads.strikinglycdn.com/files/a697e7a6-8707-4b83-8007-cbc874119b48/gemini_ganesan_suruli_rajan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6f9608a-3cd0-4448-b622-6524b3dc3f0d/zirejozif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4c5d0db-c74f-4768-8d0a-c174b2da5949/rukopidadiv.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/28290197444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1893523-2375-4d02-83b6-ab976b7ed8fc/66220805223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdcc2510-242f-4a5c-98eb-d30bb1464f3c/zoboxefezuvewuzamevelisel.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BF 5076 bytes
SHA-256: 1868652d6782c0d665960fe0cb678e37fed2b204907ad0a98e34be391187377c
font_01_sfnt_off0000e23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 4664 bytes
SHA-256: cdc1cc8ef030c774908e9482a20858a94bafc110a3c6e20014bd0fcbba0c8d8b
font_02_sfnt_off0000f21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 11104 bytes
SHA-256: a1326e62e14edb0c31293c9274725f3d4cfe73df1307068f8ce7a6758af0ecd6
font_03_sfnt_off00011806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11806 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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