Malicious PDF — malware analysis report

Static analysis result for SHA-256 42bb69314e3050e2…

MALICIOUS

PDF

93.4 KB Created: 2021-03-01 20:57:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b6157e1a2f91eecd243549f2a7bcf93 SHA-1: ffb3e386967e547a0cdc774d20d046da44daefc4 SHA-256: 42bb69314e3050e2c1fef27a331960d66aeb7442e9a593efa5490fb84d01e06b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, indicating a link farm for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external URLs. No scripts were extracted, but the PDF structure itself is used to host numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/award?keyword=linear+algebra+8th+edition+solution+manual+pdf
    • http://zumepaposakuf.scienceontheweb.net/57147987110.pdf
    • https://cdn.sqhk.co/nexasolonit/O90gjVp/95066191007.pdf
    • https://kivinogafuwej.weebly.com/uploads/1/3/4/7/134702495/bajuvijoni.pdf
    • https://bivesazi.weebly.com/uploads/1/3/4/6/134652180/548982a.pdf
    • https://cdn.sqhk.co/kefekawit/fLsibgg/superstar_life_cheats_for_diamonds.pdf
    • http://ruguwafe.scienceontheweb.net/reviews_of_keurig_mini_plus_brewer.pdf
    • https://kasezikibojeg.weebly.com/uploads/1/3/1/8/131871727/451287bdf64d0c3.pdf
    • https://cdn-cms.f-static.net/uploads/4383679/normal_60329bdd54679.pdf
    • https://cdn.sqhk.co/lukuvekeliki/hfIjcLl/matrixyl_10_the_ordinary.pdf
    • https://cdn.sqhk.co/zuxafopagad/0QllnfB/city_builder_games_on_steam.pdf
    • https://vemusosafuz.weebly.com/uploads/1/3/1/3/131398108/zofazizenalib.pdf
    • http://mosebuzixat.mywebcommunity.org/rinase.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://faleferesevo.onlinewebshop.net/wijavon.pdf
    • http://buzanuziti.myartsonline.com/nothing_else_matters_tab_acoustic.pdf
    • http://xuvuzonixo.onlinewebshop.net/vaxotidib.pdf
    • http://ralirajuz.atwebpages.com/does_stock_market_open_on_veterans_day_2020.pdf
    • http://kozogasivufi.myartsonline.com/pumatagomim.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118bb.bin
441b5e43434fa66023dc894274d1c61e2013abb602601bd86475fa5b2f1b04bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118BB 5732 bytes
font_01_sfnt_off00012bff.bin
6309865cd811170c039077839e28012383f3909f77daeee66e232f74271862e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFF 2248 bytes
font_02_sfnt_off00013584.bin
6f7170fbbbb5a09ca7d207db9554ced260e9f82b8541bf8bfda04b528c122979		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13584 16292 bytes

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