Malicious PDF — malware analysis report

Static analysis result for SHA-256 a617be0572221fd9…

MALICIOUS

PDF

84.8 KB Created: 2021-09-12 20:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 74266f78ed8f33ef5248689b2f270b44 SHA-1: 0956f16b6d1dbf4a5aa9e10c3c2adc75981732f3 SHA-256: a617be0572221fd940e0ab8eaeb6474c452db703fd269a978e0bd155a1c78cf6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malicious content. No scripts were extracted, but the overall structure and URL distribution suggest a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ashleymongolia.mn/uploads/files/34604661062.pdf In PDF document text
    • https://turkeyinsurance.info/images/file/5700288757.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/40444264607.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/tixev.pdfIn PDF document text
    • http://jaatkinson.com/userimages/92088315041.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/32194503731.pdfIn PDF document text
    • https://tcremich.lu/files/files/12493289393.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/51946056832.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/31798057609.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/12588740441.pdfIn PDF document text
    • http://timebymtm.com/upload/files/japevamolegufavu.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/gatanafavov.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/94822160163.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff443083a2---nevibufaref.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161353a91268b4---xododevitofenir.pdfIn PDF document text
    • https://birudongker.com/contents/files/95099312515.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/fadetakuzovi.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/tizozebego.pdfIn PDF document text
    • http://heureka-cz.eu/files/79493551342.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/64730216845.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/nusuripede.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/90488853204.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210910_2D8F90E84A2B7098.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef25ed6494---55081529135.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6135224D5D6E0.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=phone+hack+prank+appPDF 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_off0000e5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 10160 bytes
SHA-256: aefc30abd323e44f4ad54b450d9fe90c93daa76d9765ba02d78045d3270acb48
font_01_sfnt_off0000fc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11462 18800 bytes
SHA-256: 831ff3e9f61d910a736b0b559f89aced91a61b38011cc79db4d62e115174b99e

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