Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5416be3c1332b0…

MALICIOUS

PDF

73.5 KB Created: 2021-02-23 23:46:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 06e86ecda894d3f6b0a794eaa558273b SHA-1: e59767a151a3385b4ff40d2a9e2116e063294bb4 SHA-256: 8f5416be3c1332b08af71da889c277d4be1f4f03af54d22670b8146e18bbec8e
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 a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm designed to redirect users to potentially malicious sites. The presence of embedded URLs and the overall detection scores point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://maypoin.ru/123?utm_term=prisoner+b-3087+online+pdf+free PDF link annotation
    • https://cdn.sqhk.co/jotapepikota/gihfTii/faily_skater_free_online.pdfIn PDF document text
    • https://cdn.sqhk.co/tefaxobaf/jiawzia/marshmello_dj_wallpaper_hd_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420903/normal_5fd2611b30229.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393370/normal_6003604631d15.pdfIn PDF document text
    • http://afracheat4.xyz/vanirisagu3azzu.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/gUwQicc/angry_anaconda_snake_sim_3d_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413693/normal_602d74cf223c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382412/normal_6013322833c25.pdfIn PDF document text
    • https://cdn.sqhk.co/zodavujera/jSQXkN7/bridebook_the_wedding_planning_approach.pdfIn PDF document text
    • http://trujillostacoshop.com/different_types_of_magic_in_harry_potter29fha.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374364/normal_60091d4f9a4e0.pdfIn PDF document text
    • https://cdn.sqhk.co/vateviti/jihZQic/rupemuguvefog.pdfIn PDF document text
    • http://barashik.space/fetal_distress_adalahg6q0n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383680/normal_603114d903b3b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zatunikepozis.epizy.com/moregoxenapusawufovezifu.pdfIn PDF document text
    • http://xikimafelote.epizy.com/59816515896.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE32 5580 bytes
SHA-256: f4af2f457aed602d601142d8324b0a8e488531073880585bf96970315529b82e
font_01_sfnt_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 11800 bytes
SHA-256: 3767ab15e8bd4bc7bc33d6ac17be99024622efb0784e4e8df90c13daad9a5274

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