Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be5b9fc6b6eb468…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 07:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c30d99e7dda1eecccce0b3f8febe4c6 SHA-1: 6ec7263845e64f804d8ee45ad3820cf72ca14def SHA-256: 9be5b9fc6b6eb4683cbe01675461852f34750ccb3b24b5c23c1af77ec918ea97
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many hosted on disposable domains, which is characteristic of phishing or malware distribution campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URI patterns suggest it's designed to redirect users to malicious sites, potentially for downloading further payloads or phishing for credentials.

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 http://tecnoservizi.com/userfiles/files/82300458207.pdf
    • https://takarasushimn.com/userfiles/files/kimewewofoxe.pdf
    • http://ubestsports.com/imager/files/20210919032813.pdf
    • http://onroerendgoedindex.nl/images/uploads/wutolejilofezajiruxovuzal.pdf
    • https://llbyggodesign.se/UserFiles/files/22716596293.pdf
    • https://nieruchomosciprzetargi.pl/files/file/60216711529.pdf
    • http://sbs-group.co/userfiles/files/94874336087.pdf
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/10168817014.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/jupebobobofegadofojop.pdf
    • https://melnikhouse.com/userfiles/file/78656943093.pdf
    • https://nacituran.com/userfiles/file/73443622730.pdf
    • http://sevvalturizm.com/rsm/files/tomatejuzava.pdf
    • http://coaching-scolaire.net/userfiles/file/87165742171.pdf
    • http://www.valathors.com/ckfinder/userfiles/files/40956378652.pdf
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/90399836343.pdf
    • https://onsale.social-push.cc/data/fckeditor/files/75733448617.pdf
    • https://betsin.org/userfiles/files/kemedifuwojejobanev.pdf
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/65060326388.pdf
    • http://hoinhikhoavn.com/img/files/20726165924.pdf
    • http://skkl.cn/filespath/files/20210916141452.pdf
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/77382947063.pdf
    • http://timebymtm.com/upload/files/sapanusejuzuzo.pdf
    • http://www.pzkexie.com/up_files/file/76698940330.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=irctc+connect+app+download
    • 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_off0000b3fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FD 16792 bytes
font_01_sfnt_off0000cc14.bin
e42caf02b0999d4106be81592218d9595cd09c7955db90c9be8c4e58a1c220f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC14 10284 bytes
font_02_sfnt_off0000e35f.bin
c3002c29caeea4a40bd42a41e30f5ef4903bbd1093cd595fdabb534e6736d937		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 16732 bytes

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