Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa25d2e7b0412cbf…

MALICIOUS

PDF

73.8 KB Created: 2021-03-05 09:12:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9727019b31b001edada697476484dd18 SHA-1: b18e6e3458c3056f8ebc37b1364b6aacde09ac80 SHA-256: aa25d2e7b0412cbfc30e411c8acd2a92aac30905e3037dba1a42f0051529f531
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to host malicious content or redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://gimoguvi.ru/strik?utm_term=what+is+the+salary+of+a+compliance+manager PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390081/normal_5fd1ef6619376.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449788/normal_5feb55345d2b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376869/normal_6023edb49f77a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482009/normal_6036f7937a6d5.pdfIn PDF document text
    • http://zedateve.mypressonline.com/dokusiz.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/83724734818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426408/normal_60154c4d63e0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479210/normal_6021bf2984343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375073/normal_5fd8bbdd977c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_2e13ceb72311409a9a8000ceb5c8dc19.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79832239-055c-4f24-99fb-b4f484ad536e/kuvame.pdfIn PDF document text
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_37166507cb2a43b59cd9eb014143bf99.pdf?index=trueIn PDF document text
    • http://vokesakogo.onlinewebshop.net/bulefurukuxobogeno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdc5d76e-4fef-4ca5-bf89-a54ca7ab6d6a/5670284859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fa2c38a-1cca-4be9-81c6-0304591ab7e2/puraritugov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d7d865b-aa5e-4880-b7ad-ddb23e622ed2/how_long_bradford_white_water_heater_last.pdfIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_7bad667f0ba74a8da025086d9c2de7a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a6ade96-8a3c-4135-89b4-736f97ae30f4/13215983475.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_off0000e144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 5544 bytes
SHA-256: 44e94f46d96cf33f468f4774ca5b11e09c1cc23a21ad32a846e754d7143aa964
font_01_sfnt_off0000f40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40D 11212 bytes
SHA-256: 032296ba7dc525c8d00efaa9150ce3e94f72bcf4376e2e301646eb716c64e16d

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