Malicious PDF — malware analysis report

Static analysis result for SHA-256 44fe50a1f899427e…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 11:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 36a81b2e15e844691621dd7156d00a9e SHA-1: 072fdec570e74e984e9bb96b34bec8140f1174ed SHA-256: 44fe50a1f899427ee91cdb58301246f12ee72fc0490291a472f90f4b13ebe712
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and a heuristic identified it as a link farm. ClamAV and ML classifiers also flagged it as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an intent to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/nowimekotefapixigutikiw.pdf In PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b82c6e993f---puvovufiremajimuwil.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/ruzodujuvewabarujenaxa.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/maxoletatuba.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/mabet.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/zunulopepibowol.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/goxokukegi.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/16502770869.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/kikupe.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/23047656168.pdfIn PDF document text
    • https://insp.biz/img/file/82653106652.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/1295030325.pdfIn PDF document text
    • http://zerosquareonline.com/file/99933586749.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/rizomaridepazeton.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/gukakenedom.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/jekotoropafivapozator.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4fd439a00---36652728007.pdfIn PDF document text
    • http://dsagco.com/Upload/file/36050967455.pdfIn PDF document text
    • http://kgmda.com/upload/files/89038015093.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/88399784734.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/94113404609.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/ziwawilaxatufefifolakiba.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/39967468320.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/diwilamaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=dream+league+soccer+first+touch+gamesPDF 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_off0000d6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 17748 bytes
SHA-256: c41267026204b9f4a910c0276e98ed2a5c3bc4689a3671ec6e892d9432e7636b
font_01_sfnt_off000104b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B2 10780 bytes
SHA-256: 08f6d0dad2aded12528d68d27ef756cc48e7e80824030134645ea71c900521b2
font_02_sfnt_off00011d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1