Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ff76f5994fd959…

MALICIOUS

PDF

68.3 KB Created: 2021-03-24 01:21:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7db15039bfe13400a05e056064e2cf4e SHA-1: 585b877a566c93a84481dea780ddcde2abefb73e SHA-256: 38ff76f5994fd959366f2d15ff29b9a89e0c0f391f631255f1e24988cf43bb70
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/123?utm_term=macsales+format+ssd PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424376/normal_601304f1d691e.pdfIn PDF document text
    • https://nemelodanunoju.weebly.com/uploads/1/3/0/8/130874480/5b4ef3cf.pdfIn PDF document text
    • https://cdn.sqhk.co/kifukuvitog/idieEhh/7573674018.pdfIn PDF document text
    • http://moxegelubopidi.sportsontheweb.net/migugonovarazis.pdfIn PDF document text
    • https://dudasajaje.weebly.com/uploads/1/3/4/3/134362454/3178202.pdfIn PDF document text
    • http://ita-talia.fun/heir_of_love_choose_your_story_mod_apkyv22k.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/Khfjdjc/15402021309.pdfIn PDF document text
    • http://getdouche.xyz/323582944573sbqr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381788/normal_60037a86690ef.pdfIn PDF document text
    • https://cdn.sqhk.co/nomazotesi/jaMDohi/red_robin_royalty_sign_up.pdfIn PDF document text
    • http://sepozimog.scienceontheweb.net/cannery_row_chapter_13_summary.pdfIn PDF document text
    • http://djami.ru/sony_dsc-f717_memory_stick_compatibilityvbfbw.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/hhdhhjd/62032498896.pdfIn PDF document text
    • https://sejexogubason.weebly.com/uploads/1/3/1/0/131070030/figazojenip_nitusuvonafivov_bejonafa_ziduxok.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/HUOhiid/cake_recipe_without_egg_and_oven_in_marathi.pdfIn PDF document text
    • https://nuzotononi.weebly.com/uploads/1/3/4/0/134012627/togavifofafaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jatoxat.atwebpages.com/43951071469.pdfIn PDF document text
    • http://gajopule.myartsonline.com/sets_relations_and_functions_class_11_notes.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_off0000cd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD93 5172 bytes
SHA-256: c75bc55eb8f0517633a38ed9f8e718865076806ce9f785b628c4a7ca8440bb95
font_01_sfnt_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 10560 bytes
SHA-256: 6c837cedfda128d5dce13a51082b489365af37f82b0598f06fd0ed7464fd5d60

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