Malicious PDF — malware analysis report

Static analysis result for SHA-256 116342ff9ae7692d…

MALICIOUS

PDF

83.7 KB Created: 2021-09-12 13:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a16e7d2ea37c5c12822c430e3bfa88e7 SHA-1: e67b4f1e082fd99f298aa77318bda07c40eced3f SHA-256: 116342ff9ae7692d5d3b775743175a7a81fab4218cb9cbccbabdbd73f5181c18
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high number of distinct hosts and links, suggesting a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure points to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://marjoyunlar.com/calisma2/files/uploads/76628141135.pdf In PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/tisati.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/putigakofa.pdfIn PDF document text
    • http://atek-ent.com/upload/file/79587333314.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/sebobeporupi.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/35006860706.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/xolipevulozukumaxesusuw.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/50071651639.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/571594408.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/gunisu.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/gepadevexu.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/bovafufomedunisuwosoz.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/74dfded65ee835351683b78067f63779/79049515217.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/tebixokisapesevadobefem.pdfIn PDF document text
    • http://mp-journal.com/media/file/1266708388.pdfIn PDF document text
    • https://qkon.ca/images/file/digigudoxa.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2b68ad23c---43134204344.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/fapilolufur.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/jawafupovojupirububebaba.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/11223457597.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210911_2C0D7AEBCCE817EB.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/dugot.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/14782228431.pdfIn PDF document text
    • https://cian.hr/userfiles/file/solekobokokerubus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=real+android+gamesPDF 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_off0000e427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE427 17664 bytes
SHA-256: 6c1c0bf44a10e64828978d01c62deedccd382d04d0c0c345eb3a62e2968fff80
font_01_sfnt_off000111c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C9 10540 bytes
SHA-256: c3787ed42f04d3ace3a70bb62d0d3220fcda93e63d6979da10c22b687274c392
font_02_sfnt_off0001297a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1