Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bfa6032a736e2f…

MALICIOUS

PDF

68.6 KB Created: 2021-09-30 17:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 476e35eb6c15d012f7dee61e2ac94df6 SHA-1: 8dc3cd3b60d0102626acd81ebfdc6026f9a0dc19 SHA-256: b3bfa6032a736e2f17db987d7acde49b08b7bb9bc7e493aad655cbdb527801cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious or unknown domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the phishing/malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161464c24604ac---10007565402.pdf
    • http://mega-treid.com/userfiles/files/wagukezod.pdf
    • https://jdrum-music.com/uploads/ckfiles/files/10655900148.pdf
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/zewunurijajoxadofasonel.pdf
    • http://www.beautyvogue.ch/Files/file/wululudokedorilokigemaki.pdf
    • http://opersan.com/file/ruforawefemumowo.pdf
    • http://union.travel/ckfinder/userfiles/files/20411364491.pdf
    • http://dansecyr.ca/pdf/file/51103542924.pdf
    • http://ms-beauty.com/ckfinder/userfiles/files/xazatirudalagakexe.pdf
    • https://telorgabus.com/contents/files/niserijerafoles.pdf
    • https://larioenergy.net/uploads/file/nepedumiwavenusap.pdf
    • http://greenglobepms.com/uploads/pikunupera.pdf
    • http://ritadas.in/userfiles/file/bovibigogidazomumix.pdf
    • http://neteyes.eu/editor_up/74809455022.pdf
    • https://adikketiga.com/contents/files/miramofovitekizuzilunem.pdf
    • http://wellgroup.cz/UserFiles/File/pakamavosufotugu.pdf
    • http://biogenetec.tw/image/files/20210921_143733.pdf
    • http://nyitotthaz.hu/userfiles/files/77100047092.pdf
    • https://quangcaomattroi.com/uploads/news_file/xivawazisuvuk.pdf
    • http://aostavet.it/userfiles/files/64831356993.pdf
    • http://doktor-okonski.pl/uploadimg/file/18206856998.pdf
    • https://aparcaderoshaddaichile.cl/uploads/images/files/mevirodisoxiwinopad.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=family+guy+season+8+123movies
    • https://www.justwatch.com/ca/tv-show/fa
    • 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_off0000ac9b.bin
c9009b8a73e344651340e10e113525b9269aec116204718918b6ff1f47f2b415		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC9B 11060 bytes
font_01_sfnt_off0000c676.bin
c2c663b9b5b5aae434343c493473ef973116f6f92f8dd24d4d88985c5c3fa85b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC676 15672 bytes
font_02_sfnt_off0000ed3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 16792 bytes

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