Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ae6c10aed8b2eb…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 23:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b23a455ffdb4db0eaf9eb85b1ab09e42 SHA-1: c8693f177728987ee71b06219e515d812fb3dbf7 SHA-256: a3ae6c10aed8b2eb7a15c8968963a7f64a38cb6c1e5b37119e76095dac53d7e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to potentially malicious or link farm domains, disguised as software download links. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for a large number of links, suggesting an effort to obscure the true malicious destination. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://wastran.ru/uplcv?utm_term=gba+emulator+for+windows+10+free+download
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/gugerimumepenutopo.pdf
    • http://peter-scherer.de/userfiles/file/pimititewikusugokaxol.pdf
    • http://starcity-vinhomes.vn/app/webroot/img/files/38277473191.pdf
    • https://ip-pharma.net/data/files/8180135970.pdf
    • http://thaoduoconline.com/userfiles/image/file/88749810862.pdf
    • https://shunnasato.com/32193099420.pdf
    • http://wixoon.hu/upload/file/siwizedeku.pdf
    • http://www.valaisconsulting.ch/file/luzokosoviribekoriba.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613359ae63037---86334671103.pdf
    • https://equalitas.es/userfiles/file/22231580814.pdf
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vadisoradazarupofizok.pdf
    • http://trevorhannant.com/70006486730.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0d33845d77b36d671474c40783d6a1dc/70585368994.pdf
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/wapami.pdf
    • http://avon-bratislava.sk/files/files/vugumaji.pdf
    • http://thietbikhachsanvinhhung1.com/upload/files/mivopunomofajevixixisuro.pdf
    • http://mxag.com/upload/browse/file/kamaneremopo.pdf
    • http://nhuaduongnhapkhauaz.com/upload/files/31712665558.pdf
    • http://majortaylorride.info/images/uploaded/file/89999398235.pdf
    • http://przedszkolenisko.pl/userfiles/file/goliwivipiw.pdf
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/fugejowawekopulukikusawu.pdf
    • https://wfca-czech.cz/temp/userfiles/files/sizabosuv.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_off0000d985.bin
a3bfdba9751f9d33aeb084ae90330b3fda8c419bd40db31e25579b8ceb821502		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD985 11056 bytes
font_01_sfnt_off0000f356.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 16792 bytes
font_02_sfnt_off00010b68.bin
9bf727a3ded751e5d4a2f9834615530235a3ba32494f2a68f0ba5fb6cbd1203e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B68 17064 bytes

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