Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b3e411fea85a32…

MALICIOUS

PDF

72.4 KB Created: 2021-01-15 22:30:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 835a161f8abe943b7d8dbfa668ab7eac SHA-1: 9f213b23b64c139057105daa6887669a8ba52ac3 SHA-256: 36b3e411fea85a32f8d189a73667dc3316ddd70e60ff8d71af4d6f0e15dfc05d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly support its malicious nature, likely for distributing further payloads or phishing.

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://traffking.ru/123?utm_term=warband+start+guide PDF link annotation
    • https://wisapemewe.weebly.com/uploads/1/3/4/7/134713478/daccee8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5f8845b7f2735.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/wjhzsge/tusikefusubaganabewele.pdfIn PDF document text
    • https://nesibebinirudeb.weebly.com/uploads/1/3/5/3/135311353/gokimijetakana.pdfIn PDF document text
    • https://tolixolosunep.weebly.com/uploads/1/3/4/4/134403343/gosivawonarez.pdfIn PDF document text
    • https://tumopododekup.weebly.com/uploads/1/3/2/6/132696021/xadobowa-madera-gurokupani-rodadojuzigajug.pdfIn PDF document text
    • https://site-1184420.mozfiles.com/files/1184420/disofaxiz.pdfIn PDF document text
    • https://site-1178634.mozfiles.com/files/1178634/monogolf_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/fozuwasixeja/idiegfU/zone_max_drift_simulator_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417675/normal_5ffb610ae5227.pdfIn PDF document text
    • https://pudijubo.weebly.com/uploads/1/3/4/3/134311311/0806f88e696be76.pdfIn PDF document text
    • https://buwefube.weebly.com/uploads/1/3/0/9/130969915/92c7bfe45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408987/normal_5f9fa9daeb949.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/K1LjgKD/91011849295.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484618/normal_5fcc0dac21b02.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02D 5116 bytes
SHA-256: 565929a24324de813aa4ed98928e92c046d60dd190a67be16e2db913d7ea7851
font_01_sfnt_off0000f1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A9 10212 bytes
SHA-256: 11be6051ede3fc92144437948744fdc30fe5b1e504a47ceb9ffbcd8cf59444ed

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