Malicious PDF — malware analysis report

Static analysis result for SHA-256 8071f96af1768305…

MALICIOUS

PDF

79.5 KB Created: 2021-02-27 07:20:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 16a103365f48f9f6796d568b6a80b58d SHA-1: 3db8a12974e63328e9d6a3355412a70559552470 SHA-256: 8071f96af176830534cf13421a0dcfff9a7aac8714ae6f6eb47a752720b449cc
186 Risk Score

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, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection scheme.

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://leonvi.ru/123?utm_term=my+charter+remote+stopped+working PDF link annotation
    • https://telixezudaridif.weebly.com/uploads/1/3/0/7/130775339/47573bad5f.pdfIn PDF document text
    • http://wesifugutedif.iblogger.org/nixon_watch_repair_calgary.pdfIn PDF document text
    • http://topfrag.rip/9764311521ps477.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/ricidig/planet_warming_topic_of_concern_crossword.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388620/normal_5fdd5d0540ea3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426814/normal_601f408a2558b.pdfIn PDF document text
    • https://vujivizu.weebly.com/uploads/1/3/5/3/135305207/xijenavuwajorojuf.pdfIn PDF document text
    • https://zaxizibu.weebly.com/uploads/1/3/4/6/134672664/fuzepuluwijer_kowedidezebu_zoniguvisulu_xuzefowofari.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492892/normal_60387a50d68c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470226/normal_5fe507f5c5fdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495244/normal_5fd61c3760524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409607/normal_603996058c30c.pdfIn PDF document text
    • http://trokot-online.xyz/tchibo_cafissimo_classic_service_manualkkmih.pdfIn PDF document text
    • http://goodsfor.life/vertex_astrologia21bwk.pdfIn PDF document text
    • https://cdn.sqhk.co/pumevigatare/chiu4NL/crowd_sounds_nfl_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379483/normal_5ff0edea5cc32.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedatowuka.epizy.com/24412354893.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 5720 bytes
SHA-256: 9c10a2457d60e568523341beb03204c550612ed13636327ae2b00fc8876ae866
font_01_sfnt_off00010d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D65 10340 bytes
SHA-256: 10fadb0d56fcb76cb75de4e7a80bd8e9ebd2444b8f8264cb8edb994cce066f40

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