Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db8ed721a35c4f6…

MALICIOUS

PDF

95.8 KB Created: 2021-09-09 09:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3888e219a8acf6156b3a885b67199161 SHA-1: 2bae9dad086f0d5b83c076d9201cb2d227ecfdb6 SHA-256: 8db8ed721a35c4f61e0603d643c45a8d3293ba8b61485859778a97f183404b8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, indicating a likely phishing or malware distribution attempt. The PDF structure and embedded content suggest it's part of a spearphishing campaign, aiming to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://krisoc.ru/uplcv?utm_term=laparotom%C3%ADa+exploratoria+pdf PDF link annotation
    • https://middletonchambers.com/ckfinder/userfiles/files/3224022237.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/33910157994.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631005416.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/suwalusez.pdfIn PDF document text
    • http://winso.tw/userfiles/file/xoxovoxonanakasikolum.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/73566793378.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tifevojuluruga.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/14405546088.pdfIn PDF document text
    • http://mestan.by/images/file/71606773452.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161342af8dd8f5---finewikunez.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/tidurusukebikekiz.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/worarifusojufuje.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/kozejudowo.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/nanirokosoletadasu.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/7166993080.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/75991016211.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/nomujasamatepunuz.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/31092065348.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/sixugiramatudeguwunas.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/81199757387.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gumidosukovekolejagepe.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/47071551264.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/92287476574.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/sokasupevojude.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_off00010bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF1 20260 bytes
SHA-256: 2e32120e8e9023f5b2d4bd7fa10af7ac84737d7c37f59308e50e44d3980a1193
font_01_sfnt_off00013fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15800 10508 bytes
SHA-256: 548e5084bdda231de3a3c62222ea05372ec3943c02da0f6cf3250198926a7916