Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d35e4ca78dac849…

MALICIOUS

PDF

69.4 KB Created: 2021-09-13 22:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2ea4fdf17d47e7834eb01c1e4bd321af SHA-1: b8d3ad1a59d1e4cc96cd730cade567ede85e1236 SHA-256: 0d35e4ca78dac8491aec3b8f139f0320454b53c4f6d8696830a9fa33c591166a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting. While no scripts were extracted, the structure and numerous external links suggest the primary purpose is to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://betamachinery.sa/other_files/File/26460663496.pdf In PDF document text
    • https://llbyggodesign.se/UserFiles/files/nodoketiximakazokapudi.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/tuwamofalef.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/wekit.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/36524633812.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/94673005859.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/pekaz.pdfIn PDF document text
    • http://robbes.nl/media/files/fubudigobojurugobekitotur.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/gigasetedelaratabaw.pdfIn PDF document text
    • https://kawanmto.com/contents/files/vukotapiri.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210901160913.pdfIn PDF document text
    • https://mediaskills.rs/files/gubapelivakutanawasijekam.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/zafatikejikizelule.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/11219136583.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/42797706073.pdfIn PDF document text
    • http://salt17.com/userfiles/files/xupelowegopevarisefenuwen.pdfIn PDF document text
    • https://gencatakan.com/upload/file/punesuwobubuwafini.pdfIn PDF document text
    • https://eguiders.com/uploads/694042669.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/gekotunowedidesipinafe.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/22554241424.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/91539253406.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/12314393295.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/38503805697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+web+controlPDF 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_off0000b169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB169 10240 bytes
SHA-256: 72eed377b12fc94a5f239556c2a567f5648c97a5d8e057c1dec7a866dfe1a256
font_01_sfnt_off0000c88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09E 15624 bytes
SHA-256: d233365cdc3c80886cffda17333266907f46711e65f7aebfaa12ac44e8af82e9