Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c9cb3c82b2fc33…

MALICIOUS

PDF

76.7 KB Created: 2021-09-26 19:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 91843979a7c707effc81a736b3e83f10 SHA-1: 0526b610ac774c63847fff89662f2430a2501919 SHA-256: 44c9cb3c82b2fc33bd5d916e766bf7593d8801d0d1f9a76ff341e45dde2c9379
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to disposable hosting. The document body is heavily obfuscated, but the presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=best+speed+test+app+for+firestick PDF link annotation
    • https://epponline.com/mentorfinancial/page_images/file/ziwutokejalurapafubik.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/45884866065.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16146ea71143c3---36627839805.pdfIn PDF document text
    • http://fivelscope.net/fckimages/36319920977.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/51616921954.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/80854660437.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/69832180060.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/41480808287.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/53225923696.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/69981570842.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/lofajokotewama.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/nimowe.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/nejikumojapefoloposi.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/domemibekuxubobofa.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/jogawin.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a75b6a5c2d---ramixuridoxifi.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/fatekogawijak.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/90089387344.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/28bea10a92a8f41255c5b7efc9c93e8d/96894255536.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/pakubibawokomafemen.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/latulajore.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/1298166263.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/54317016825.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_off0000c523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC523 18276 bytes
SHA-256: 96787c2a0f14c59c38613818b9346d8708488145d0d5cf80d361eedd295b037c
font_01_sfnt_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 10608 bytes
SHA-256: 02bcccf2096a771ca3b5b1f54980ce1afaa99c1928c937f6941a3db8022ab989
font_02_sfnt_off00010d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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