Malicious PDF — malware analysis report

Static analysis result for SHA-256 891a7a11453ee4e4…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 19:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f05244ccb471f28b6846c09015b5e43 SHA-1: 666278876cd8d9ce2c1118fa5acedcc16efa3265 SHA-256: 891a7a11453ee4e482bcec9165328277ac21ac479da567641bc69bef8bf901b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to other PDF files, with one notable example being http://cementfeet.com/userfiles/file/vefadasuxiruzunakemef.pdf. The presence of a Google feedproxy URL suggests an attempt to obscure the final destination or leverage a trusted domain for initial redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cementfeet.com/userfiles/file/vefadasuxiruzunakemef.pdf In PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/23650975819.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/tizozebego.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/57394084874.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/18354724930.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/dariwipixew.pdfIn PDF document text
    • http://hnhappiness.com/d/files/52415281538.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/26376914162.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/96880240509.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/gexulusagafixekinutavur.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/2097685055.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/65790025664.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/5221970638.pdfIn PDF document text
    • http://grossbuch.com/upload/file/38557331986.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/nokijatawebumup.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/96051318136.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/11647769043.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/tugugisidetaropamu.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/nititititam.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bamupeluvumolaf.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/11067754625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=gomovies+malayalam+online+watchPDF 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_off0000dcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB6 18168 bytes
SHA-256: 810f83fe507fcc6830ea9719a3f2e082b7da98d87fc1e243ee19edcc1e36aabc
font_01_sfnt_off00010bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DE 10700 bytes
SHA-256: cbd1ac55efb25e92e7f1e0505fc67c9a49fa8e981196675a38d6449a3b179465

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