Malicious PDF — malware analysis report

Static analysis result for SHA-256 a276a836de3210a2…

MALICIOUS

PDF

91.6 KB Created: 2021-09-24 06:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f447067c40523947617a0ebd3ec1a2da SHA-1: 13bab85f0279372608c902e9c3b608228896ac91 SHA-256: a276a836de3210a2001b57992285e04ae9db0397af5befc649b17a72a7551fbe
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files, suggesting a multi-stage download or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://dworbieland.pl/userfiles/file/42666295551.pdf In PDF document text
    • https://joebalogh.ro/imagini_ws/79557148310.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/jirobokab.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/97473307379.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/89796961287.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/45177906688.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/69753647908.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/28737781606.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/78581668400.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/7659589386.pdfIn PDF document text
    • http://mamitobe.ru/files/file/19777083687.pdfIn PDF document text
    • http://jucal.es/images/file/bofanotuvopotalajupizumax.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/pamuwaganege.pdfIn PDF document text
    • https://italvaping.com/file/zuvitepaxekewu.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/ruwotabuzasemejugafo.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/posamesuji.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/68185531619.pdfIn PDF document text
    • https://bagstyle.uz/images/file/fumasux.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/dofolidiborurubuzomerum.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/80646664280.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/34385574061.pdfIn PDF document text
    • http://decorstore.eu/upload/file/92257131452.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/jaliwujimeduvukuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=sheep+farm+frivPDF 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_off000101b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B9 10228 bytes
SHA-256: db1ee3ae8d6a0953f726a463d3ad30c987c1f9b9a3e604327618c28f4c60b4ec
font_01_sfnt_off000118bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CE 18708 bytes
SHA-256: 97b410875aba68d118ef687afcc3e57dc3dcce94150e06d587cf36fade380bf6

Open this report in the interactive analyzer, or submit your own file for analysis.