Malicious PDF — malware analysis report

Static analysis result for SHA-256 07aa0aabf9096ed8…

MALICIOUS

PDF

72.1 KB Created: 2021-01-05 19:21:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 936d0be69201786f3976c69e90fc47ec SHA-1: 65c5e61c2689785623af00ba10f3fdc00c58af39 SHA-256: 07aa0aabf9096ed850bbd52922cc626e83dec45720ba4cb260350ce0ba5e42c5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive URL usage are indicative of a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://trafffe.ru/123?utm_term=tv+guide+beckley+wv PDF link annotation
    • https://cdn.sqhk.co/tokititagiwe/Oigjche/60577735971.pdfIn PDF document text
    • https://cdn.sqhk.co/firijanab/fXPginf/97066867721.pdfIn PDF document text
    • https://cdn.sqhk.co/pobusafi/FSYhggh/indoor_mazes_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/fipexuwebo/1heZic0/lanilaxudilodamazo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415304/normal_5fc9ab022ed81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477921/normal_5fef3b4dc2a5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412174/normal_5fe891e782056.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381740/normal_5fe22ea0bbaa5.pdfIn PDF document text
    • https://rimosuvifakub.weebly.com/uploads/1/3/4/3/134310068/2473456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427781/normal_5faed7cbe7c53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447431/normal_5fd174e40a924.pdfIn PDF document text
    • https://cdn.sqhk.co/pofifarim/hhrm9y6/sony_premier_rewards_login.pdfIn PDF document text
    • https://cdn.sqhk.co/nazopekujavi/Sid7ihx/adderall_xr_generic_manufacturers.pdfIn PDF document text
    • https://xojujafu.weebly.com/uploads/1/3/4/6/134633902/devuk.pdfIn PDF document text
    • https://cdn.sqhk.co/muzorefu/dnjhdha/just_draw_game_level_15.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_off0000dba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 5028 bytes
SHA-256: b257198c455078962bcca468afc07e6a5c8b327b62f36c14abb9bf6aa993bd25
font_01_sfnt_off0000ecfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 11868 bytes
SHA-256: bc3011b730ace13a7dcb4c4c426f805f620394bda7ec41aa6567a016cc800395

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