Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91c5105c7d2820e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 00:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 78ae26e708684fe024758108c04a20ac SHA-1: b7692b5732b37c264245f88c69f5623654f23527 SHA-256: f91c5105c7d2820e23bac2c947dc840e391f67475d02b5e47f7039d30d69b4a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as a link farm, indicating a likely attempt to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://xn--80aer5aza.xn--80aai5amepo3c7b7a.xn--p1ai/ckfinder/userfiles/files/13200908136.pdf In PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/xadekajapasabi.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/texubugus.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/66187107393.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/wifotobomivusaxixesiwi.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tafijuxi.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/54573794629.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109031244419346.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148f8ffa5e04---14733741023.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/46150745221.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/48620367397.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141fe2d6eb1d---79672070046.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/kuwozin.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/36147965204.pdfIn PDF document text
    • http://matrixpaint.com/ckfinder/userfiles/files/givekivonojukop.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/webeloga.pdfIn PDF document text
    • http://hzqzg.com/d/files/2752650427.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/xagakuzabuda.pdfIn PDF document text
    • http://rurisnet.org/images/file/50314700621.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/68135314690.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/marabarovekavepoxefo.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/83941819092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=avatar+the+last+airbender+free+online+streamingPDF 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_off0000d9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E3 10988 bytes
SHA-256: c571cb78e0962602bbae52becc49770919fea71247635374f20431d08b110572
font_02_sfnt_off00010b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B00 17920 bytes
SHA-256: 5678cd4c9a8ec304fdca7ebb914e5dd443334d857afa48e944f2d2a975d8cd5d

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