Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a134c4097fe54c…

MALICIOUS

PDF

69.0 KB Created: 2021-09-29 06:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 765794a28374dc1a63c742182501a161 SHA-1: 48767c180d52240beacc13c4db2fb6d4ded1c81e SHA-256: a1a134c4097fe54c323324aa3369912ec600d1f9b5f0a45a9e1bca5822f29ea2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=best+word+to+pdf+converter+online+free PDF link annotation
    • http://gyogytornasziget.hu/uploads/files/85526717092.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/tubixufenigim.pdfIn PDF document text
    • https://grnca.org/img/files/files/73408230504.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd3283a5e3---90842264844.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/39128899980.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/96190169020.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/govepazag.pdfIn PDF document text
    • https://eetravel.net/file/90934321964.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/83812363437.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/jepiwaretexedosawipuded.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/54468803663.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210902/1842223076.pdfIn PDF document text
    • http://sun-tes.ru/files/file/71318717225.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/77730552063.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/66725590803.pdfIn PDF document text
    • http://gapp.fr/medias/files/17056895478.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/409656995.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_off0000a9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9AC 17700 bytes
SHA-256: 72bfc4320846ed87fa5f903650e1376640e34369ec2b397625f84a08a905bc1d
font_01_sfnt_off0000d698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 10656 bytes
SHA-256: d22f4140a954a8eff553179619c070a9a8b63c3bfe422d1cad61a97ccbdb87de

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