Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce7dec9777d8e51…

MALICIOUS

PDF

86.1 KB Created: 2021-09-17 08:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8df0c20848a334b07486d7e83ff74d98 SHA-1: 9308b002c19f330750e70a02dbe30f1048637d9a SHA-256: bce7dec9777d8e516661f2cfeab4d5824e9dab8e3e73e07b77cc5b6cd7a2a783
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crm333.com/documentos/file/kaxugonetemes.pdf In PDF document text
    • https://uleshuzataruhaz.hu/files/file/69201847124.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/sojexifiraxibajat.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/20888225433.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/63596122161.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/86840428027.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/45049232815.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/29865432253.pdfIn PDF document text
    • https://nistd.in/userfiles/file/66649946602.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/71740920731.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/62140763940.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210905_213630_188.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/64411585908.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/d6geh38ubj0n3qrp4mk9d6cpq6/kexisipematofufetirux.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/gitewad.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/zomomemipaf.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614257744f52b---dugev.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/5469037051.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/94436528242.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/77320516144.pdfIn PDF document text
    • http://klaaswester.nl/img/file/gugabilu.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/98746702339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=animated+emoji+app+for+androidPDF 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_off0000ebb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB7 10556 bytes
SHA-256: ab034957c2b3945f8af5a6318247c662d29e15815156b647939ee31c48cc3a6f
font_01_sfnt_off000103ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 18092 bytes
SHA-256: 63a889b5a4f2c16e6ae8f11c1c2a470780824d4a805f0c39407d132d832c84bb
font_02_sfnt_off0001325a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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