Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4dfa2f34599717…

MALICIOUS

PDF

76.6 KB Created: 2021-09-26 00:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87b5ab2012cb26cf79b75d736afa2115 SHA-1: 29213b3715bc5fc0269aa11726040246dfec5b5b SHA-256: 3b4dfa2f34599717e8e734d1317bfc1906f31c6f0a7a8e8ab2ab6fa4607c9497
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including random and disposable link farms pointing to other PDFs. The ML classifier and ClamAV detection strongly suggest maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely leveraging an exploit to execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://envida-nieuws.nl/bsb_website/upload_fck/file/78121411785.pdf
    • http://hoya-system.com/uploads/files/202109231800277947.pdf
    • http://uptindia.com/newsimages/file///maxelakan.pdf
    • https://giritrademark.com/content_files/files/fopowixojawitasi.pdf
    • https://globalmediaminds.com/uploads/files/giganikuvigiza.pdf
    • http://puebloexec.com/userfiles/file/26159722649.pdf
    • http://preciz.com/uploads/wysiwyg/files/36506039946.pdf
    • http://ovstav.cz/app/webroot/files/files/nufegijav.pdf
    • https://kozlovka.mebel18.com/uploads/files/25191973483.pdf
    • https://stpeterscbs.ca/ckfinder/userfiles/files/sarov.pdf
    • http://gopherandsquirrelcontrol.com/admin/images/file/tubonaturaxapaberarosomo.pdf
    • http://cassotech.nl/site/data/ws/files/jitexijojeteberudav.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1614be047801b4---83558797508.pdf
    • http://terezszilvia.com/images/uploaded/file/tabobukavot.pdf
    • https://noelex22.org/userfiles/file/62417321868.pdf
    • http://eksternest.be/images/file/ratebeboxabixaxidogijis.pdf
    • https://study-abroad-travel.com/ckfinder/userfiles/file/87014474164.pdf
    • http://hzbmsj.com/images/upload/File/57404718631.pdf
    • http://bixenony.com/userfiles/files/foxebonosanefibo.pdf
    • https://spacio.hk/attachment/file/54402543993.pdf
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/80253014687.pdf
    • https://rockeit.com/userfiles/file/julujonumasinotupux.pdf
    • https://globalmediaminds.com/uploads/files/72619895729.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d5c0aln8ffbhfb74s0tspd3es/65016563524.pdf
    • http://feach.ie/images/uploads/file/1955865792.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ielts+trainer+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0e5.bin
fe6cb2dc544776355066de7c9a675e04b837e66787ee13e6c24347f0fe2f9a50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E5 10324 bytes
font_01_sfnt_off0000d83a.bin
1d8ca4cd29af67f491d46ffb4e71ceec0e6c0dcf13f5354872a240ffdee723e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD83A 20736 bytes
font_02_sfnt_off00010d4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4B 16792 bytes

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