Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d876a102c623a3…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 12:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 218446ffa35d29ff5200afbc4c883710 SHA-1: 0da7fcc326db79dec0e82810f9925803c5ce0e4c SHA-256: 23d876a102c623a38f8901788733891c7e1ddbb3ca7c73fd7e89f6ea75ddac97
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://philabc.ru/uplcv?utm_term=root+android+head+unit PDF link annotation
    • http://udaybharat.in/ckfinder/userfiles/files/vozew.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/xezubagagizawatofimutate.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210901223433492.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/tusubonalimuf.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/33260479923.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161304a832dcdc---berigavudokekaj.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/32044028724.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/14910123885.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/66486224108.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/54134154474.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/71227990075.pdfIn PDF document text
    • http://japhina.com/upload/file/26213521632.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/55555926366.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/bamafejotuvupogamexe.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/zegovoti.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/98148745122.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/66043810516.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/84090686980.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/87447149126.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/84796557859.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/df9a87bf0a80900ec258acbb6eb3a87f/sugapajaker.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_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 18612 bytes
SHA-256: 6061c1779b252ea66ffbd9939d4f03ec6c24a26041a352697ff18be3f87cb912
font_01_sfnt_off000108ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CE 10276 bytes
SHA-256: 3566a02c607fa16a71dcb3b235298d435d17b241438112a83351c237809dbff0
font_02_sfnt_off00011fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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