Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1695e552ae9cd3…

MALICIOUS

PDF

77.1 KB Created: 2021-09-18 09:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 99d9944fa559b372b79cc351c2312da4 SHA-1: 590d93af7c17587fab36ae8f686bb88ffc82fed5 SHA-256: 5f1695e552ae9cd375e55e5493e2390f0ef4258b95df2e55386044775f71bdbd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs further supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://garglob.ru/uplcv?utm_term=c%2B%2B+projects+pdf PDF link annotation
    • http://rgn2u.com/userfiles/files/bajuvaduru.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20728648442.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/rapewatix.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/zenigusu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ee3fcb868---nuwek.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/rogudiniki.pdfIn PDF document text
    • http://slsnn.ru/content/files/vogetanemevesolimozipaj.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/e058a25a64e2d9d48fd57f97dcfe6421/76297451606.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/44590048548.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210917121838.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/11163169703.pdfIn PDF document text
    • http://kd-council.com/upfile/files/kawazupozejixife.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/jezojepabagak.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/35743912884.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/xuduwuk.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210913_F9D10BB61E777FF8.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109070635247219.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/puvixuzi.pdfIn PDF document text
    • 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_off0000c924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC924 10368 bytes
SHA-256: f6b074f5bbedd00abbe6373d9d3b461e78a8a187b8d23ecbf46cc157b94b4341
font_01_sfnt_off0000e0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B7 18196 bytes
SHA-256: 2276bf199427c85012f10aad551e71a67ac96fbf54e8fab1df0330e9d8c236a3
font_02_sfnt_off00010fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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