Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b15261bed20825…

MALICIOUS

PDF

104.1 KB Created: 2021-02-22 09:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b564148303693a5fcc9c88c016268d38 SHA-1: 235bb54152643851f7e9af28a773ea859c91fffb SHA-256: 40b15261bed20825b1d0fb7db115e30fcfcce4155e62b6a7a2640d3bf2377826
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 hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely related to spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=hegemonic+stability+theory PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476420/normal_5fe904b98a545.pdfIn PDF document text
    • http://prod-fruit.space/wonutimiwd23.pdfIn PDF document text
    • https://kepubaxolawava.weebly.com/uploads/1/3/4/7/134703856/9321486.pdfIn PDF document text
    • https://bijimuxe.weebly.com/uploads/1/3/4/8/134886115/e677dc619f72dd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459469/normal_601989de2cc9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_5fe920e8c4db8.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/cjiwhfn/alien_poker_pinball_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417139/normal_6000caa6b613c.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/hcicbhh/aimpoint_t2_micro_mount.pdfIn PDF document text
    • https://cdn.sqhk.co/niwonosorude/higGNQe/simply_learn_languages_app.pdfIn PDF document text
    • https://cdn.sqhk.co/surixirulol/agjjaWU/73134283216.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/dyjchhA/12415329310.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495839/normal_600d90eeac1e6.pdfIn PDF document text
    • https://cdn.sqhk.co/wotirixa/jjVyjbU/fotujefuwotarujanubelifo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_602f983e823f2.pdfIn PDF document text
    • https://lamuwopinu.weebly.com/uploads/1/3/4/6/134632291/levavavinonuwek.pdfIn PDF document text
    • http://smartline58.ru/authority_jeff_vandermeer_reviewf92wv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475562/normal_602917c297aa3.pdfIn PDF document text
    • https://cdn.sqhk.co/nufopusifa/cBji2SZ/kibitepalebemukoz.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwevini/gd1qn62/zonegeparigilexefow.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_off00015959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15959 5416 bytes
SHA-256: 690d9fb09994c7ef49f7f526052c14565349413ce132fcb7fabb5867f8380fe2
font_01_sfnt_off00016ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BA7 11852 bytes
SHA-256: 949f6abac1482aff86c54e26baf1a7322b11877722facb881c40160fcd1e5945

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