Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f479c56b2258c4e…

MALICIOUS

PDF

69.2 KB Created: 2021-10-02 11:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cef6c379866ecd4d376f1c555e2b055a SHA-1: ccde22f994c7e3d0c2e79eccd2000dacf105bc0b SHA-256: 3f479c56b2258c4e9d6005e1d165d8c2ed7139456e063a0ce0c984d6b224716a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or redirector to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the PDF's structure as a tactic to obscure malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a512dda17---2958972486.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e79c990d4c3d7515513fe7d6b512b1ca/81818030274.pdfIn PDF document text
    • https://aokman-drive.com/d/files/89677888571.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/81140019892.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/18577376636.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/74860678845.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/27714536890.pdfIn PDF document text
    • https://ebmcordelles.progess.com/userfiles/file/51036632661.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/18716155534.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/potonador.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/43226974673.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/nujutilef.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/1769420754.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210918_59057FE3990E2C7F.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/43581320224.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/rupem.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/5156133428.pdfIn PDF document text
    • https://aildf.in/userfiles/file/jurevulufatakukewedi.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/10228620398.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/75791942714.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/12123639897.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/gavezikavolikebuz.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/6117987178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=whats+4+to+the+5th+powerPDF 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_off0000ad77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC589 16692 bytes
SHA-256: 53429b77962c26a2681588dee1610c8be38ee1ec4a239accd659000ed4d2c26b
font_02_sfnt_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 10400 bytes
SHA-256: de973c1784fe5cec8abae7dfa7f44d4e378f4ece267a3dadac96dbe292b87228