Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25ebdbd07ccd630…

MALICIOUS

PDF

80.2 KB Created: 2021-10-20 10:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d098957563c2d62cb8800a6ce2cb59a5 SHA-1: f2e808cd8c6042b98ec3b0f7b07c53acef1670e4 SHA-256: c25ebdbd07ccd630062fb93e4127f92c644c4c869cf36e280ff6af0ccaf4174d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a likely attempt to redirect users to malicious sites. The `wkhtmltopdf` authoring application suggests it may have been generated programmatically for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=how+to+download+free+music+videos+on+android PDF link annotation
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/63610724376.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/faff520a807b903ce93e8fd5e126dda7/pobegolirakuzux.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/91222701532.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/84291007878.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/81117136379.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/6070193735.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/gevuranugatugutofiligu.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1630699698366406628.pdfIn PDF document text
    • http://bushurov.ru/images/files/fegakibixule.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/kilivusanetijibakikevuj.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/tupezuzarirubapu.pdfIn PDF document text
    • http://hocomesun.com/upload/21146769199.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/gamazijitofupufa.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/64958186655.pdfIn PDF document text
    • https://signika.pl/Upload/file/xufobatefokajos.pdfIn PDF document text
    • http://delve-cr.com/uploads/diriwiwokelitifawuw.pdfIn PDF document text
    • https://ka-base.no/images_students/files/81155120326.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/veworojikaze.pdfIn PDF document text
    • https://servicepapik.ro/files/72817377611.pdfIn PDF document text
    • https://equimat-cheval.fr/file/34781318695.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/lefamu.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/26597100488.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158168db51f4---suvovumuligogajorevag.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_off0000d2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E7 18028 bytes
SHA-256: fccf4ec0ca4d237a8353c853c954f3af63152ddd5282e022f8ebdb7d6e6750e8
font_01_sfnt_off000101ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AB 10880 bytes
SHA-256: 99ccb7950e6a029fa92e2c191f6a9151dccfd36e30c5d7afd545479e8146afb4
font_02_sfnt_off00011ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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