Malicious PDF — malware analysis report

Static analysis result for SHA-256 544dbe941d933b3f…

MALICIOUS

PDF

81.9 KB Created: 2021-05-17 06:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e582105b76198b868d560cd8059c9ae8 SHA-1: 5c1c0473a8470d2a833da4a28c19dc972bd9c865 SHA-256: 544dbe941d933b3f67306a2a0dea0d6059468e966982ff85da7b456b45993d22
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one pointing to 'golowaki.ru' which is flagged as a potential phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://golowaki.ru/strik?utm_term=what+does+seeing+a+snake+symbolize PDF link annotation
    • http://videohost.space/fuzekqb4h0.pdfIn PDF document text
    • http://torchland.xyz/craigslist_atlanta_muscle_cars_for_sale_by_ownersoe8t.pdfIn PDF document text
    • http://salearea.pro/wivevasasgkry4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_600a3e16e4b1c.pdfIn PDF document text
    • http://iqecoportal.ru/how_long_do_kindle_paperwhite_batteries_last40pw2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488103/normal_6002369f3c88a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467912/normal_5fe46e9fe7bf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467564/normal_6029027cda3fc.pdfIn PDF document text
    • http://shopwithsale.website/rijidubamz5o6o.pdfIn PDF document text
    • http://urolog.xyz/moxemaxamonuzizos63jfw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405899/normal_5fe8ed30e8d35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374177/normal_60047e58bd9df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_5fda06ae5374d.pdfIn PDF document text
    • http://mybestchan.online/ramunakalilazetutqxdn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393514/normal_6050e53621271.pdfIn PDF document text
    • http://vipadminler.org/best_college_algebra_calculator4jw9f.pdfIn PDF document text
    • http://farvestnn.ru/603798205934o4y9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451021/normal_5ff69f5eaa07e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://b6e49935-6d58-4bde-831f-6e0b746776d3.filesusr.com/ugd/7d321f_de1b00af8e8946a2b43ae36fdbc69f7c.pdf?index=trueIn PDF document text
    • https://a3abd3d7-f7e4-4b0c-86b7-ec358d8c805a.filesusr.com/ugd/97a3b3_bcce4672ce4c459999e7e756bc1239cc.pdf?index=trueIn PDF document text
    • https://c93e3e17-565c-496b-95a0-45fea83b015f.filesusr.com/ugd/cd9bb8_35799e2d0a4d42d5b1fb147b022ef341.pdf?index=trueIn PDF document text
    • https://536432c6-7160-4795-b32c-faef63afc1c8.filesusr.com/ugd/5e2347_36c72ebdd960415f803688a2c53b862f.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 5300 bytes
SHA-256: 8e606c6338ba46bb7a2226de95c1080db4d90ab2313ce9eaeec5d1c0b003fcbd
font_01_sfnt_off00010818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10818 10312 bytes
SHA-256: d4e69ced99de7e4a45f44a68026a5aef3e96ede3dd71e8a04ba05bf1fcdbb111
font_02_sfnt_off00012b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B73 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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