Malicious PDF — malware analysis report

Static analysis result for SHA-256 4992f34e4fb3767d…

MALICIOUS

PDF

76.7 KB Created: 2021-02-24 12:09:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 11ff1f99bb94065cd768c1ff059549c6 SHA-1: 3012514b49b167bb91864a6d185122dc3eaa9768 SHA-256: 4992f34e4fb3767d7a1e723557c5a59e0d576058bf53376b3adb3fed50d953b1
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or redirectors, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=how+to+size+bike+for+child PDF link annotation
    • http://magicwoolshop.com/penguin_pet_live_wallpaper_hdej9wq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486197/normal_601725c0b8229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479942/normal_602d666db8159.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454161/normal_5fff97e818ffc.pdfIn PDF document text
    • http://lerob.info/secondhand_lions_full_movie_free85pff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424683/normal_5fea0f34b8152.pdfIn PDF document text
    • http://yarrebitteh.online/cnn_student_news_weekly_quiz_answersozvsb.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/gihhhig/dungeon_crusher_soul_hunters_wiki.pdfIn PDF document text
    • http://jofarofuwudeveb.66ghz.com/lagu_its_you_ali_gatie_mp4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452861/normal_600ec25408a9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475987/normal_5fcbcc997584d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403274/normal_5fc5f4e74f6d3.pdfIn PDF document text
    • http://trend-sales.fun/giwerimefex72.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bidesomixanir.rf.gd/zugonudab.pdfIn PDF document text
    • http://wisigisovet.rf.gd/76714059532.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_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 5204 bytes
SHA-256: 11a6693525fbd21d47664f144141739ee054bc09393362a600b513f1a763cf5a
font_01_sfnt_off00010250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10250 10432 bytes
SHA-256: 6ab7c5ab728b39744995f34d0ec199e92c88575d9aecf2d82d798c7bf117e675

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