Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c8f829a4054b42…

MALICIOUS

PDF

79.9 KB Created: 2021-09-15 20:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ca2cc6c80cf7d412da3aae55c8c08814 SHA-1: b0c164dc109cbe90d9d4a475c65daec6648ba6b1 SHA-256: d7c8f829a4054b42f5849caab12bcafc85ca607d8d941cff3efdfca6a0e2188a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://beldapin.com/calisma2/files/uploads/mizamedi.pdf In PDF document text
    • http://alltechsro.cz/files/81899150450.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/zaxivizifonobikul.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/55982298008.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630988944_6669cd3d4c.pdfIn PDF document text
    • http://blgjad.com/upload/files/sazusofekoxozinoluve.pdfIn PDF document text
    • https://bem-sa.com/img/file/16235347259.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/dibagakefasizilebuxepa.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/dusamomunomujenakigidubex.pdfIn PDF document text
    • https://jin-ji.com/upload/files/73652966174.pdfIn PDF document text
    • https://successalpha.team/upload/files/81321802733.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/vasazepefijuv.pdfIn PDF document text
    • https://clinicscrm.com/img/files/sufegopuwusejoxutav.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rtbtargibvclfbarof8tofrj82/56856045675.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/tofenimufafokad.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/93886100665.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/fuvidijepaxuresege.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353b57317df---winowufuxepunopofiligasom.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/7966829179.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/ab8ab7366e2ac3249aec667a9976072e.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/bopisokokedovuwuferufex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=my+android+contacts+are+not+syncing+with+googlePDF 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_off0000d1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 17864 bytes
SHA-256: eeb2aacd9326933aec7ba2a39591f5a85eecabf9144b69006ceef823d2d1d802
font_02_sfnt_off000118d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D4 10844 bytes
SHA-256: 089d10de4f6820bf27a2ba97b7d3bc263c252d081ab8df16383e85b2818fa66e

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