Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8f70ca12d5d439…

MALICIOUS

PDF

74.5 KB Created: 2021-04-03 05:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 734cc7ea0fd0deed87ab6a0e407d017c SHA-1: cf0b94187f11bfcca04e6430c793812e60bfcfe7 SHA-256: 3a8f70ca12d5d439065ab6967bffacdbd62f5d0612bde796168bd918edae3179
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL `https://xajibur.ru/strik?utm_term=what+are+the+asian+stock+markets+doing+today` is presented in a way that suggests it's a search result, further supporting a lure-based attack pattern.

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://xajibur.ru/strik?utm_term=what+are+the+asian+stock+markets+doing+today PDF link annotation
    • http://aires.fun/genudogekosoqniri.pdfIn PDF document text
    • https://josuriwomevopi.weebly.com/uploads/1/3/4/7/134769094/zeramitikojodi.pdfIn PDF document text
    • http://hookup668.site/excel_features_built-in_preprogrammed_formulas_calledzc3p7.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/dubudeb.pdfIn PDF document text
    • https://litapofigiwo.weebly.com/uploads/1/3/5/3/135349015/rodupuzawupororagi.pdfIn PDF document text
    • http://mosquito.codes/26586804437xyype.pdfIn PDF document text
    • https://fepirajoruvizu.weebly.com/uploads/1/3/4/3/134311883/1f8fe899d9ae.pdfIn PDF document text
    • https://teviwodujote.weebly.com/uploads/1/3/1/4/131453741/a081fcef4.pdfIn PDF document text
    • http://securityverifiedservices.com/4505841025u7ipg.pdfIn PDF document text
    • http://xexobifu.22web.org/2936411548.pdfIn PDF document text
    • https://josafobuwevaj.weebly.com/uploads/1/3/4/4/134464642/7741119.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_c77c665a42a94ab69a4be0343682c517.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9af45ef-3131-45e9-ac58-ed665f9ada75/black_and_decker_convection_oven_replacement_parts.pdfIn PDF document text
    • http://bekabugi.epizy.com/bixolon_srp-_350plusii_driver.pdfIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_e55c456ff8eb41268975b21efc674c05.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbd47590-86bd-4211-b9a8-6b39dfbc540b/62587473681.pdfIn PDF document text
    • http://xemubekimivimed.epizy.com/gozotimaviveze.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE430 5500 bytes
SHA-256: ddc77a034dd1d76864ad4f6bd9d0dc2c8f8c0568179dfd2e68f8c98762f02188
font_01_sfnt_off0000f6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CC 10988 bytes
SHA-256: cc18b1cbf844ce03b38dc2180a3400efe36bde908ca442f2911307fb30ac1016

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