Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecf9fdfdf80c725…

MALICIOUS

PDF

76.9 KB Created: 2021-09-20 17:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: da0006650129bfe79fb1e01b5356d36a SHA-1: 4ef285597b3e57695b430ccabf1d5941725081ba SHA-256: cecf9fdfdf80c725f289ce6bcd9e9779d9447d353edef1b5a852f3cc44b2808c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the phishing/malware distribution attack pattern. No scripts were extracted, but the sheer volume of external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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=programa+para+actualizar+android+motorola PDF link annotation
    • http://baikalspring.ru/ckfinder/userfiles/files/44924678790.pdfIn PDF document text
    • http://fitviewer.com/files/file/tunawodebajamuwu.pdfIn PDF document text
    • http://runo34.ru/attachments/file/midenabipuxa.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/27870487875.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///88257223451.pdfIn PDF document text
    • http://gr-chem.com/upload/files/kekiruve.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/kepaxalupekuzavafix.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/33935777975.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/33758801465.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/42989460466.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/rabasukajig.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/tidavuzofoj.pdfIn PDF document text
    • https://biomisszio.hu/tmp/vefifozupojudesofag.pdfIn PDF document text
    • http://smirna.pl/files/file/20284208799.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/23188354253.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/tinuvixusak.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/33848536457.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/fonuvabuxuretoxi.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/jewejosigozefumomo.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/84487224367.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/kasap.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/fisupewezadeken.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_off0000c6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF02 10716 bytes
SHA-256: 2e8cdf443908f29a45034e32df43ce42118753d6e97d25d310cdd97ab5e44d2c
font_02_sfnt_off0000f763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF763 17960 bytes
SHA-256: 0952cf80fcea4095a99f220d59a512a56203dca190c6acdfea0aa667bdfbcf0e

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