Malicious PDF — malware analysis report

Static analysis result for SHA-256 5318f67d11b800b0…

MALICIOUS

PDF

75.1 KB Created: 2021-04-01 20:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c23288d9ec80d7047d8a6f18bca70662 SHA-1: 723f61db901b14bc47eddebca22779060801ab66 SHA-256: 5318f67d11b800b01216433673c04adea99a0da5a898f30c3dc8dfabab9cc46b
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, many of which point to disposable hosting services and are likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'international business management notes'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://xezojetit.ru/award?keyword=international+business+management+notes+pdf+download PDF link annotation
    • https://cdn.sqhk.co/fabokofe/qhijiyQ/88181432775.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/IYV28jh/green_potatoes_inside.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/cIhhv5K/daddy_long_legs_movie_cast.pdfIn PDF document text
    • https://kajilavenusifo.weebly.com/uploads/1/3/2/6/132683330/bef9452ba63.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/rhPhdjg/7044466706.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/hifkidc/lapoxotuvipol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443588/normal_5fe8d8a26ae78.pdfIn PDF document text
    • https://tejaxoxujita.weebly.com/uploads/1/3/4/3/134368030/769885.pdfIn PDF document text
    • https://cdn.sqhk.co/tozimozeka/QjcL7ji/62338906481.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374211/normal_60035196968e3.pdfIn PDF document text
    • http://xokapik.mywebcommunity.org/47677857137.pdfIn PDF document text
    • https://widosogepe.weebly.com/uploads/1/3/3/9/133986955/xozelir-wukokelidar-ditulube-tuzixubawiniduk.pdfIn PDF document text
    • http://dujegud.getenjoyment.net/ataxia_cerebral.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/12837524829.pdfIn PDF document text
    • https://bazulerijodinib.weebly.com/uploads/1/3/1/8/131856415/kanev_dowofur.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/chjfgg8/the_triple_entente.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/zunaporam/goblin_guide_modern_deck.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/gilagajuwuleg.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_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 5528 bytes
SHA-256: 65d6970ae10208013a9419aaf4934f5859a9313babd3afae3ac9e01b5ffaec12
font_01_sfnt_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 10608 bytes
SHA-256: 1f8e5fc1415b962f946a8c5b056a676435608154fedf08fcbc1015739d582bdb

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