Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c6b72125387a96…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 12:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 04dec828feb7452a7a8b9aba74d7bb72 SHA-1: 7be00aea7869430334915b0fa13e26d2519da0a5 SHA-256: 77c6b72125387a96ec9c7bf5d7d6ac5f97546ae4f5f8296c41de3f67def628aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, which is a common tactic for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://abwingscolley.com/uploads/files/mawituvajegedorunav.pdf In PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161410d8acf3d6---dotelabekusatogoves.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/fujeronisak.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/8954326123.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/71686122433.pdfIn PDF document text
    • http://serting.eu/userfiles/files/99536055479.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/73213504073.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/4124739012.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/60035931513.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/75738938166.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/jorofuwotalexuvuwemigap.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/mebolukap.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/46380053755.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210906171501.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/tidasukadubirepanowozo.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/gajozufajegopaf.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/79423419235.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109130621579690.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/30905019685.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/wexakegawomedujuv.pdfIn PDF document text
    • http://zl369.net/userfiles/file/7384027888.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/sotuzuz.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/74244464745.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/71065350343.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/82907873720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=victor+hugo+hernani+pdfPDF 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_off0000da82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA82 19320 bytes
SHA-256: 30f22730919f4180a5f855d7e0a639ffd4dca7c0d67d1acfc226575297b1dd7c
font_01_sfnt_off00010cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD5 10752 bytes
SHA-256: cb898d17c1e836a5e361debdf66c3e9f59c0cafb9f725d2e81ca9e1298129269
font_02_sfnt_off00012557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1