Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ac3f535609d585…

MALICIOUS

PDF

69.9 KB Created: 2021-02-01 02:30:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4ec839bffae85e227d1b504e843b4c44 SHA-1: 1253a4207c09af4be1816a3b8888e5c119dd79c5 SHA-256: 38ac3f535609d5858f18ee4fd6ba23e88bac65540e52f777b4ba9ef048f3daf0
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=android+windows+streaming+media+player In PDF document text
    • https://cdn-cms.f-static.net/uploads/4490125/normal_601327335bcc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_601748eb2d15c.pdfIn PDF document text
    • http://mklhhhh.space/venofugatanapedibaxejovmdjc.pdfIn PDF document text
    • http://logmeinnow.xyz/converting_polar_equations_to_rectangular_worksheetv1dvi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418755/normal_5fcde01f6d6ae.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/HKhgBhe/barinujoridizula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393026/normal_5fd26e3552cfa.pdfIn PDF document text
    • http://girlsbeach.space/boomerang_converter_appf8yzx.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/djggjgf/how_to_cook_chicken_thighs_with_crispy_skin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375885/normal_600f4a75ee723.pdfIn PDF document text
    • https://cdn.sqhk.co/devepogisog/JHjehdl/pifebejebiwesiromevinok.pdfIn PDF document text
    • https://cdn.sqhk.co/kavuluxaja/bigCOJe/ice_cream._places_near_me_open.pdfIn PDF document text
    • http://azalea.store/pelusedowafujebarewevafujn3xi7.pdfIn PDF document text
    • http://vvd.bar/54999383278s52y3.pdfIn PDF document text
    • https://cdn.sqhk.co/dodazija/iajicii/rusufugebikitixof.pdfIn PDF document text
    • https://cdn.sqhk.co/bepesewutu/gdhbWhi/xuzetufaxag.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/lhhhjib/zogeburup.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/sjpgjb9/muwipude.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_off0000d6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E6 5464 bytes
SHA-256: 53f980e44a0ddbb81ac8d3173756477d63bfecefae7be0ac0387aa5f3d42fe4a
font_01_sfnt_off0000e979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE979 9636 bytes
SHA-256: 87b89d0a71526fcd881f0a65c2ce3e2287a4495a4fe6c75f8d40bb4c55d371f7

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