Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fea5ee6c1fd29c…

MALICIOUS

PDF

78.9 KB Created: 2021-03-23 05:10:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2a8adf59f244f78dec0ae715f00d0c1 SHA-1: ade3259988c403d4c66341cd4f5d2424d06fe8c9 SHA-256: d4fea5ee6c1fd29cffd8258dc21006ab1657b63b526f2f9affa9bc8f3fd693e6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/123?utm_term=metro+exodus+pc+performance+tweaks
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/cd49d8.pdf
    • https://nifudosuv.weebly.com/uploads/1/3/4/0/134040563/warotan.pdf
    • https://fuxusololozo.weebly.com/uploads/1/3/1/3/131380606/bolasezaw_mivojuwav.pdf
    • https://cdn-cms.f-static.net/uploads/4460066/normal_6020b57f7e4ea.pdf
    • https://static.s123-cdn-static.com/uploads/4452400/normal_5ff272488f039.pdf
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/laravurijuxi-xefikowek-fekujo-mibeju.pdf
    • http://zulesaxeririv.sportsontheweb.net/xawutaxoduxuki.pdf
    • http://gakukuketisalum.scienceontheweb.net/39858485456.pdf
    • https://nivojekegup.weebly.com/uploads/1/3/5/3/135322075/busefi.pdf
    • https://cdn-cms.f-static.net/uploads/4426062/normal_60270dd64de47.pdf
    • https://cdn.sqhk.co/sewadokoka/1gd9hbj/81679717231.pdf
    • https://static.s123-cdn-static.com/uploads/4489834/normal_5fed1b3120399.pdf
    • http://lodomujimujug.mywebcommunity.org/darurapukilanetidofolepo.pdf
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/90616379a5c9.pdf
    • https://cdn.sqhk.co/rekewuneboxu/Koggiau/sonic_boom_gameplay.pdf
    • https://babibuxa.weebly.com/uploads/1/3/5/3/135302477/4a41665a0.pdf
    • https://cdn-cms.f-static.net/uploads/4486051/normal_603ac1b161cd3.pdf
    • https://xitemexum.weebly.com/uploads/1/3/4/3/134311382/kofovosoko_lusuzoj_jiwopelolo_rozefepofite.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lekizopiloref/96466200834.pdf
    • http://buzanuziti.myartsonline.com/mepive.pdf
    • https://s3.amazonaws.com/jarawaxanivu/gst_authorization_letter_format_in_word.pdf
    • https://s3.amazonaws.com/wujafivabipo/27091241884.pdf
    • https://s3.amazonaws.com/gogoxowiniza/blog_website_template_css_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f638.bin
bc0dbc12fde802645a29a639ee16aa1407580fc7c9a41c1943cea0abf195e95d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 5496 bytes
font_01_sfnt_off000108fc.bin
b67345a51ee873405c83263057ceeba364b941270f47aaedeae8efb6ccd4c11a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 10960 bytes

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