Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a851a495b805a57…

MALICIOUS

PDF

84.4 KB Created: 2021-03-04 10:58:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 2e52fe09303595367a9adca575b2afbf SHA-1: 235c4facb94410828337d1da2da63cb68ca9ee9c SHA-256: 9a851a495b805a57f3306ca7830eade2b91073e78e01b23bcff8b24654b98aab
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, suggesting it is part of a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, references 'Huckleberry Finn quotes chapter 1-8', likely a lure to disguise the malicious intent.

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://vilenefex.ru/strik?utm_term=huckleberry+finn+quotes+chapter+1-8 PDF link annotation
    • http://numulul.mygamesonline.org/master_forge_grill_model_l3218.pdfIn PDF document text
    • https://womazineput.weebly.com/uploads/1/3/4/8/134895737/wivure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366311/normal_60058f7a0fc26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471467/normal_5fde9442a3c7a.pdfIn PDF document text
    • http://fopokigife.mywebcommunity.org/zefimisopuwak.pdfIn PDF document text
    • http://tefosewun.22web.org/bouree_jethro_tull_flute_sheet_music_free.pdfIn PDF document text
    • https://buxexuwuf.weebly.com/uploads/1/3/4/6/134660927/257159.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/jgiwP6x/47071717707.pdfIn PDF document text
    • https://lafefetakizin.weebly.com/uploads/1/3/2/7/132712235/3053900.pdfIn PDF document text
    • https://cdn.sqhk.co/baxalelizop/3GyigfF/balalegid.pdfIn PDF document text
    • https://gajebafanagifim.weebly.com/uploads/1/3/2/8/132815836/losiniguluzixuxem.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/6kigUhg/8078582435.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/katawa_shoujo_hanako_route.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380682/normal_5fdc83f873e4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465539/normal_5fe89d144c138.pdfIn PDF document text
    • https://cdn.sqhk.co/xafileme/jgDAjgQ/hockey_monkey_irvine.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/24787811588.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/linksys_router_ea4500_manual.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/9547880.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rupesujutiwu.myartsonline.com/mibimazikajaf.pdfIn PDF document text
    • http://nupakavidowux.epizy.com/jopatubideses.pdfIn PDF document text
    • http://dekubovuvupo.epizy.com/short_wave_diathermy.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_off00010c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 5772 bytes
SHA-256: 3ab3d46627ebf0ec61fc37421bb7da70cbd23f8bfaf3696ecf6cf7c9c776bfeb
font_01_sfnt_off00011ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFC 10708 bytes
SHA-256: 7019e9f563459c247d24826b0c251efbf4f8aee1697b56295f62ba4aad72adda

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