Malicious PDF — malware analysis report

Static analysis result for SHA-256 176579305dc85733…

MALICIOUS

PDF

82.6 KB Created: 2021-09-11 22:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 81ca9caf9d5366391b0ff5d347a70446 SHA-1: 0df8b8a89c89bbb1c868a8b129d122ac711b3ba7 SHA-256: 176579305dc85733a681f89360fc0470eefcfcfd4cc83edd04a4beb7ba3dc2db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or redirection scheme. The PDF structure and embedded content, while heavily obfuscated, are consistent with malware designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=ten+letter+word+starting+with+a PDF link annotation
    • https://biographiewerkstatt-singer.de/userfiles/file/gafexome.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210910101428.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/sogavedazusox.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/1479008577613341ac4f4e2.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/jotewaratuj.pdfIn PDF document text
    • http://sakem.org/userfiles/files/toliwowapozijejitip.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/xorimovevetamowawopafufas.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132b434979f2---nisajifivowole.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/92437002069.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/95547893639.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138c21b823e1---vowadugasek.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/73761986758.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/65531642662.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/zewajuxumerozabikekigubo.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210908063711052946oxd0s.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/lofeladavevejikikak.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/bizumutagepulonu.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/84679407517.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210902_777EA4BE5ECD9062.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/fakokujakaperudajo.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/49895830141.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///52992100786.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/keramibe.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/jotilagokibizatega.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
stream_004_off0000f593.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF593 10576 bytes
SHA-256: 38625d6ececa5b5ff6864ea1d0d570a394e7d7445b397169ad6cc144cdae964a
font_00_sfnt_off0000dd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D80 18008 bytes
SHA-256: 8dc3f54d640f0359cb78798d07cb098b01de9035861bc1dd4388adffaa723cc3

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