Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee3a040a99525f2…

MALICIOUS

PDF

70.5 KB Created: 2021-09-18 06:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5842121f24010bf8423d264b7147e1a3 SHA-1: 3a5934c202d5359f252dcb0bbcd01001462aa6ee SHA-256: cee3a040a99525f2501dcdaa7f13d5d648cd437b6f0a9d9464133ef607443b05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected 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 used to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=get+rid+of+chat+heads PDF link annotation
    • https://milsagliksen.org/upload/ckfinder/files/mitamusirot.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/xepalipawixip.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/68644010497.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/safatuw.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/40711041046.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/kubixolibajedekeriwitobog.pdfIn PDF document text
    • https://campermagazine.tv/public/file/parezuregisaxon.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/nuluwidokiguruf.pdfIn PDF document text
    • http://steinemann-ag.ru/40895018054.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/67874610535.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/4742171510.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/98107564609.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/85756981906.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/21792516217.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/41766778096.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/jovawi.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/fibukurijokotopuko.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/88644792322.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/8708754678.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/bikugujimaribolozep.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/82703753272.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/tamaripolixesurek.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/xikopivotapewuzitimozeza.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_off0000b503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD15 15536 bytes
SHA-256: 4510d725a59e91ad6699596c58b35b3409b5b2d1368a56ceaa97a7228bc4916f
font_02_sfnt_off0000f4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 10464 bytes
SHA-256: e8fb05c5725d0ebaa42511d2221de3059806139d7d528b69d50d811b913de1f6

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