Malicious PDF — malware analysis report

Static analysis result for SHA-256 18738102e15830e4…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 20:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 007a45b5cecd074df9a97ade5fb48603 SHA-1: 2ca756ebe57d6056edf942d589b4ad8f644c2df7 SHA-256: 18738102e15830e46d139cb39641c0c1d7eccaf8998fbc94a66da7b00c6f4b66
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or distributing further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://synerhu.ru/uplcv?utm_term=what+can+you+do+with+phantom+membrane+minecraft PDF link annotation
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/29014699599.pdfIn PDF document text
    • https://wasael.com/userfiles/file/18091149824.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/xudovofoviguduti.pdfIn PDF document text
    • http://donghotam.com/luutru/files/poxabofeb.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/xojiniwikiwebasumaje.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///malovutefadumu.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/mogofawo.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/95509304186.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b8c1b804c---12536534548.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/48803732189.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/50117911327.pdfIn PDF document text
    • https://granitnet.hu/editor_up/34656161049.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355e0ae3edf---lafubowejarafejeperimakip.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/fakeva.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/rudajoz.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/fotivaji.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/tovujogavanilumokivo.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/8578481576.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/tifopobavajixunopuromevog.pdfIn PDF document text
    • http://rem-proekt.com/f/file/84361411825.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/muratojinavisekodijiku.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://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_off0000e511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE511 19496 bytes
SHA-256: 9daf857368ffe42d3f60a1ab1a5b211c820060b0a21dfc1f58fdd626d2ba289b
font_01_sfnt_off000117fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FC 11104 bytes
SHA-256: c9e89a3e5c52a14cdf178400f474873e68c2623c3c8e20774c6aa6469699545f
font_02_sfnt_off00013190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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