Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4064766e9e24b5…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 20:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8c9cb1d12413121cbcfd444b912849ec SHA-1: e1b0c8e0b1d1fad00dee10813438788e2b10c71b SHA-256: 8a4064766e9e24b5cf66f6ef53b52aa7c8d565f7e72fa45fab51b743f4a96e86
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high likelihood of malicious intent. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure to a phishing or malware distribution site. No scripts were extracted, but the PDF structure itself facilitates the attack.

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 http://vodnik48.ru/content/file/56588526447.pdf In PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/0561a5657bc27999c38a28cdbf5b54cb/pufonowolejom.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/xozijirumikebawofebap.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/96863455027.pdfIn PDF document text
    • http://rhondachem.com/d/files/mufewefufuk.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/32069637552.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/37736584428.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/bageguxedifibogigumoxisep.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/nomuporajovila.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/vatolanopev.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/20524614857.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/popesenutitafemolobavubow.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/28602506689.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/13874592333.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613347065b156---pixukudevekujunewijid.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/podipad.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/jememigeluxuweb.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/mijolifo.pdfIn PDF document text
    • https://digireg.it/upload/sexorunerivedatewibuk.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/depuxuxo.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/1537743191613837fbc6222.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/98128815993.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83261463327.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/13754449757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=gta+san+andreas+free+windows+10PDF link annotation
    • 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_off0000df87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF87 10600 bytes
SHA-256: 2a7118095f43a2e8bb07b253c57ea56dac5b766d4f12666ddea644e2ca80a7d5
font_01_sfnt_off0000f802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11014 18072 bytes
SHA-256: 5aeaa5189ae8d6d2332a2ff96a7f45764a598a24ee03e3f87c1d1b52351df02d

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