Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a73c169d5989f9…

MALICIOUS

PDF

64.6 KB Created: 2021-02-17 21:57:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4aefb54d4f6c8869289825f26e959cfd SHA-1: 3c8c745c0da326652a5593e90d32571ec26f6c67 SHA-256: f6a73c169d5989f97b295f06e31be9e9eaa3859f030b443f097295751203fdab
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 0.9998

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://jottigo.ru/strik?utm_term=stealth+cam+number PDF link annotation
    • https://ferofetilusef.weebly.com/uploads/1/3/5/3/135346026/nixazenikuze.pdfIn PDF document text
    • https://woremudof.weebly.com/uploads/1/3/4/7/134701645/lonokaxeliwebawap.pdfIn PDF document text
    • https://rejowuboxobe.weebly.com/uploads/1/3/2/6/132680789/zuzofaje-zenibezer-disowazigi-nifuwatuj.pdfIn PDF document text
    • https://bodarisijusafu.weebly.com/uploads/1/3/5/3/135383154/wifagejobof-sawumepimigo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463560/normal_5fd78834a6589.pdfIn PDF document text
    • https://ranutejojem.weebly.com/uploads/1/3/5/3/135314135/zivix.pdfIn PDF document text
    • https://cdn.sqhk.co/kosibowo/imCedid/76525000742.pdfIn PDF document text
    • http://osummer.space/85305993937vvkr2.pdfIn PDF document text
    • https://depumubawaminuk.weebly.com/uploads/1/3/4/2/134236244/wajugi_winitetu_jajuwejevog.pdfIn PDF document text
    • http://qlemelest.online/455194613471xxlh.pdfIn PDF document text
    • http://pravagims.net/abacus_maths_level_2_worksheetsuaab6.pdfIn PDF document text
    • http://maddot.space/silovesazabusuxxwjah.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://s3.amazonaws.com/xisefowu/vegam.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB564 4828 bytes
SHA-256: 9d7571769eef3219a14e1e071a0cc81b6bfc192fe9b4af7a07ccafa4341e057e
font_01_sfnt_off0000c597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC597 9988 bytes
SHA-256: 72fa12c6f2953d50f9a1053e75d5de0204635b20aa17fdf3cdaf2bfbaeb09025
font_02_sfnt_off0000e7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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