Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f1e7eb79ddaad2…

MALICIOUS

PDF

71.1 KB Created: 2021-09-08 13:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b05c6534ccc9c7f66272a459c386c9e SHA-1: a7b1f858d61764d208e279c093db732381875ca6 SHA-256: 75f1e7eb79ddaad2d97cd7d38b9b5088859b829b59fd9f354e350467427d1598
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=makro+catalogue+black+friday+2019+pdf
    • http://paulgraphics.paulsfashion.in/files/zuwegizikuxakupezu.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wukijemupukafapukagonu.pdf
    • https://sieuthimaytinhcu.vn/upload/files/kelirifapap.pdf
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/90162663051.pdf
    • http://atlonnuri.org/UpLoadImage/editer/files/20793770428.pdf
    • http://kadh.kr/bobod/upload/file/nuxarix.pdf
    • http://boatmonies.com/uploads/files/99307833820.pdf
    • http://joesservicecenternj.com/userfiles/files/83210977953.pdf
    • http://glavis.biz/userfiles/file/33850518491.pdf
    • https://davaocarrental.com/images/file/donobexuxurafewagixa.pdf
    • https://italvaping.com/file/tajodijumixetonobu.pdf
    • http://mgtofubbq.com/uploads/files/84472455167.pdf
    • http://ibb-online.ru/f/file/zorixoj.pdf
    • http://wwstationery.com/files/file/mejamibesawogazixi.pdf
    • http://americansemitruckparts.com/d/files/rodijawenezipejov.pdf
    • http://duhochoangthanh.com/upload/files/22212610198.pdf
    • https://luiginoiobbi.com/userfiles/file/47904900592.pdf
    • https://xn--psg-9lac.hu/files/files/86736180313.pdf
    • http://babamoleskine.com/files/file/namigetabanawomadas.pdf
    • https://butchercurnow.com/img/shop/contents/42958435756.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/45585160513.pdf
    • https://ewdel.cz/ckfinder/userfiles/files/xorarepoxasaxamilafewi.pdf
    • http://bkht.vn/userfiles/file/98902434604.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b38c.bin
dc571f992e9340670341367d96c53ee9654698885bb382019370ae445f59cc5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB38C 15944 bytes
font_01_sfnt_off0000dc44.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC44 16792 bytes
font_02_sfnt_off0000f45b.bin
ccd44ac4d4fb55bdc4b10b8278592d5b81020b5c9eb0447befeabfda57155dc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 11424 bytes

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