Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d0df4d69b704d4…

MALICIOUS

PDF

82.6 KB Created: 2021-02-12 16:02:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 363e27a2592f3d640925134800e1a6ee SHA-1: 9f6431eb953d17c3ad2a3537b61674265d8e188d SHA-256: 97d0df4d69b704d4d808428c49a290b4b9636cfdb499a8161f859b58e6ddea41
194 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO manipulation. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious workflow designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/wix?keyword=the+real+jazz+solos+book+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481985/normal_5fef03d22d85b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5fe6ac9519391.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374379/normal_5fc72eda1a426.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/gdicvgh/battle_of_rome_war_simulator_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384164/normal_5fd24248d1e0f.pdfIn PDF document text
    • https://vozokeku.weebly.com/uploads/1/3/1/8/131857213/dodefuk_fugozufopef_kebinutu.pdfIn PDF document text
    • https://felipivi.weebly.com/uploads/1/3/1/8/131856333/4b6bc44be0da.pdfIn PDF document text
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/23e09817b27d045.pdfIn PDF document text
    • https://bumarotijij.weebly.com/uploads/1/3/4/6/134688095/a58375f268ab.pdfIn PDF document text
    • https://cdn.sqhk.co/moxulofilose/8vhhVib/61321749565.pdfIn PDF document text
    • https://xikaxuroloxo.weebly.com/uploads/1/3/1/4/131406092/0638b2778c.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/gefgigf/kuzipifegu.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedijudibo/hgDOfij/kepamareripe.pdfIn PDF document text
    • https://dinowupeguf.weebly.com/uploads/1/3/1/3/131379410/2095444.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370285/normal_5ff23ad72a662.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
    • 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_off0000ea85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA85 5160 bytes
SHA-256: 3eb698a413a3c50db2eefcd542b627a9895ab4cd06aef60fdc40476c6f2687fd
font_01_sfnt_off0000fc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1B 16376 bytes
SHA-256: 5be2d566eaf2053efe6f715d05397d581c14d06f88dccd57d5c987eb2168aa43
font_02_sfnt_off00012edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDC 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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