Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d17f68591668ba…

MALICIOUS

PDF

77.4 KB Created: 2021-01-29 16:16:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0b34d1b17553c375867ccbbfecc64db6 SHA-1: 91691012cbde3de2cfb24702a20fda6d6057fe05 SHA-256: f9d17f68591668ba830a320ca655b4184e819e41ae0c3e6beb910739ba7531b2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically flagged as an external URI pointing to a suspicious domain ('jacksth.ru'). Heuristics indicate the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for further compromise.

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 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://jacksth.ru/123?utm_term=run+3+un PDF link annotation
    • https://wosapinilesodiw.weebly.com/uploads/1/3/5/3/135347506/rusuxuv-rukikafuluze-vawino-xixeva.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/real_drift_pc_game_free_downloadrrq0x.pdfIn PDF document text
    • http://mjawebdesign.net/xujuzawebagabeboxtdfh.pdfIn PDF document text
    • http://ultra0.space/survival_horror_zombie_shooter_gamep1lhx.pdfIn PDF document text
    • http://item-get.top/71099667171e02uu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_5fd6cc8b17b75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375194/normal_5ff0939977937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427509/normal_5fd83777319e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gogunabones/kumaun_university_admission_form_2018.pdfIn PDF document text
    • http://senotujupube.epizy.com/bts_love_yourself_answer_concept_photos_e.pdfIn PDF document text
    • http://gijuvaginitawaz.epizy.com/tufizazufejapozaraxe.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/negavokesewililuzepotalog.pdfIn PDF document text
    • http://veguxakafopuvix.epizy.com/bluestacks_4._4.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09C 4332 bytes
SHA-256: c35f68b6ef5d1ccda6bb411776f5dade8e2407e22a29cf73acdc26397e0fbc4b
font_01_sfnt_off0000ef7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 10556 bytes
SHA-256: f8406a77acc11b7197133d5d6f9618badf2fe7e3f55f170acb8219a13ce5d88a
font_02_sfnt_off000113cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CC 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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