Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1621c4a103f3eb…

MALICIOUS

PDF

72.5 KB Created: 2021-04-13 09:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 76ce5111c4f585c2209e9dc1811b65ae SHA-1: 1ac60aa7970dde668b13c9559c683ae1c42817ba SHA-256: 5a1621c4a103f3eb39f4e9826af810287d5c3233a796b8d721cabd16cb57a58e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/strik?utm_term=engineering+drawing+table+size PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4500440/normal_5ff304ab24dc2.pdfIn PDF document text
    • https://retelajipubo.weebly.com/uploads/1/3/4/7/134700068/wupiwifevul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407983/normal_6029fe08d29c2.pdfIn PDF document text
    • https://gisijenoxumo.weebly.com/uploads/1/3/1/4/131437849/lixix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383679/normal_60025c0c86a2f.pdfIn PDF document text
    • http://xirapanagix.getenjoyment.net/ccna_router_and_switch.pdfIn PDF document text
    • https://zebakikalelu.weebly.com/uploads/1/3/0/7/130775248/595944982ef52.pdfIn PDF document text
    • https://numurivigafezu.weebly.com/uploads/1/3/4/3/134390613/polinarujajigig.pdfIn PDF document text
    • http://manibupefif.mypressonline.com/pomizunizifujajodes.pdfIn PDF document text
    • https://zigaxedalinuj.weebly.com/uploads/1/3/4/0/134016671/zirugozurikofo.pdfIn PDF document text
    • http://desawigoxikugaw.mywebcommunity.org/zuvufedasugakem.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/81068867258.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_bdee9e8acf6342348516de0930d26b5a.pdf?index=trueIn PDF document text
    • http://musowafotoxipid.epizy.com/constant_contact_email_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/types_of_gears_grade_8.pdfIn PDF document text
    • http://forarevepezifu.epizy.com/7128638615.pdfIn PDF document text
    • https://3e80c8bf-0031-4ca1-bfa9-4484641fefed.filesusr.com/ugd/08103e_488d6a0974f64aa59670fe9aa20534df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/indesign_html_newsletter_templates.pdfIn PDF document text
    • http://mevusajilitum.rf.gd/wow_classic_fastest_leveling_guide_horde.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_off0000dfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB9 5232 bytes
SHA-256: 74cb81d41ed56f385f1f4d58f830a09b90bd3167d9bd5cae49f823a59bd9f911
font_01_sfnt_off0000f1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AC 10376 bytes
SHA-256: 5740727772b31736a88bf817df7ce6ba68c9197369196619377a0f8d20a7d8d2

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