Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c6637e3103aecb…

MALICIOUS

PDF

69.4 KB Created: 2021-09-13 09:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7bb3c503a161bad34513e3a36a4a82ed SHA-1: e08ebaa8989d8908017cc4c1dd24ea0886ff96c5 SHA-256: e7c6637e3103aecb357da7d772ce5ce453332d0b5a64e5e9446534d1a2d6c69c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to other PDF files on potentially disposable domains, suggesting a link farm or redirection mechanism. The presence of embedded JavaScript, though not explicitly detailed, is a common vector for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bodymart.in/ckfinder/userfiles/files/gizesifemuzewagoposovige.pdf In PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/90120127174.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/50633667056.pdfIn PDF document text
    • https://trystsalonri.com/images/file/54937040029.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/86064384770.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/80123832721.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/11970424531.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/58589211724.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/69356892879.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/29234786257.pdfIn PDF document text
    • https://seerupit.dk/assens/file/zuzixowefidomesito.pdfIn PDF document text
    • https://codecs.ro/images/file/89782074382.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/jivuj.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137890ee4613---77164245292.pdfIn PDF document text
    • https://duel.pl/userfiles/file/99932835934.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/370rffnud0i09jft9i0kj1udh9/berojisuzewamawazugu.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090323210784.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/95812558324.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/jojilesulenupival.pdfIn PDF document text
    • http://xfswchem.com/upload/files/kozokivenog.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/wubaxirogositavavabis.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/ruzudujewaru.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/wupofaleniponepemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=nashville+number+system+guitar+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_off0000b0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D1 11220 bytes
SHA-256: f2a8fe5f54cb0eb22a60748da1db69f59308b3ad0c818b5d74adeae3e528c40b
font_01_sfnt_off0000ca82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA82 14816 bytes
SHA-256: 21ef3a1c9b74a1f3ab7a80f5981363ad6449ba13c967a74eb7bcaaafcf005fee
font_02_sfnt_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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