Malicious PDF — malware analysis report

Static analysis result for SHA-256 2367f01733c2f1f3…

MALICIOUS

PDF

125.3 KB Created: 2021-09-18 17:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e7d752449cb9ef0ed725ba9ce466dacb SHA-1: 3e91ab6e20d6970950cb4a7987850c12ed8995f0 SHA-256: 2367f01733c2f1f3d4d11eb28ccc1486a5c224362dab094850063d49b52bf721
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism designed to obscure the ultimate destination. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a tactic to distribute malicious content through numerous small, disposable links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://suavitinhtannha.net/upload/files/sipiwo.pdf In PDF document text
    • http://montazenabytkupraha.cz/files/file/gujijadirefotajo.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/38645885460.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/85691474952.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/23900828407.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/17635515504.pdfIn PDF document text
    • http://bienbao.net/uploads/files/94590894833.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/saniluv.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/54952399934.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/serarodulebosizazamo.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144415418954---31193820730.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/93537780666.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/94655278249.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/57911369572.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/xadeni.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/80824559949.pdfIn PDF document text
    • https://petikdaun.com/contents/files/gewefe.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/vodegimipixupe.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/42934737621.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/41666048022.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/xagulitopupu.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/rorek.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613341b0b9a8b---47435269741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=gta+lcs+2.3+apkPDF 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_off00018786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F9D 10308 bytes
SHA-256: 201cb0e64eb07ad798806ab9de9b0933901efdaa915fcded45d1813d3f08044e
font_02_sfnt_off0001b71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B71E 18768 bytes
SHA-256: 8b1220e595b3ad8023388ed6f085607234d4b4d5162a31bd149ec6a4588d892b