Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a5c87901d0ca64…

MALICIOUS

PDF

82.7 KB Created: 2021-09-08 14:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 80ae67eabea77c1d794482710f7f8739 SHA-1: 6815db01b0ef03a2f46014543391e0b0a48427fc SHA-256: a6a5c87901d0ca64cc3dd9c02d90f1310fca6fcddb4be52f4bd962993e2162d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the true destination by using link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://mojahotels.com/ckfinder/userfiles/files/luwafubi.pdf In PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/0a957644dd64e13b500e1148f73e75f3/21744716435.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/93077400198.pdfIn PDF document text
    • https://lasanisports.com/files/98390811608.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/kowamenugar.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/22924297228.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/tidokodopefej.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/guvumibexuxo.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/84682174939.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/dawukuxuxirofipejo.pdfIn PDF document text
    • https://menu2uplus.com/images/file/82915543069.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/ce4cfbb1b428b25a68489a632648f0a0/15396100129.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/xevegovanadivokuzatav.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/75985762871.pdfIn PDF document text
    • http://mextro.de/upload/files/33483645418.pdfIn PDF document text
    • http://moristas.com/userfiles/files/zitumilaperupale.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/ruvobuvisemi.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/28150010075.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/46849423919.pdfIn PDF document text
    • https://inks.bg/userfiles/file/51319168974.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/17013482951.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/zanexatetid.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/75193668631.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/turajov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=introduction+to+semi-supervised+learning+zhu+pdfPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1D 17392 bytes
SHA-256: 7e941b3d8b56121a078f7f9a3a6bd42d2c2114a95b08fe174874367d9968997d
font_01_sfnt_off00010a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001222e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222E 11276 bytes
SHA-256: 0edf4283354fc1de193807c63b36da5c567482dd5dc2e6255084fa3ee83c65d8

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