Malicious PDF — malware analysis report

Static analysis result for SHA-256 aafb7de66682c66a…

MALICIOUS

PDF

73.4 KB Created: 2021-09-27 17:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 219d37faaacd852ca46ed93470e26aea SHA-1: 6bf34a27c93bd2c6f0e7391b310751dc264b7ee7 SHA-256: aafb7de66682c66a2d78faae105b9c91b6dee9d86dd522ecda00921907946dee
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 links to external domains, suggesting it functions as a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a strategy of using disposable hosting for a large number of links, often associated with malicious campaigns.

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://adrfarysz.pl/userfiles/file/9400212231.pdf In PDF document text
    • https://peusch.lu/userfiles/files/92970386424.pdfIn PDF document text
    • https://cardolf.ro/files/86240018054.pdfIn PDF document text
    • http://akademibt.com/resimler/files/gesinedoxaxerez.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/27602098883.pdfIn PDF document text
    • http://www.ezmoving.com/file/vulawejexusaroluravapef.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/wirebafolojoraba.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/jelewig.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/43198137032.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/89205728301.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/fopulazujokalowifi.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210902051519_0priy4.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zajugigadopetusopif.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202191014302.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/84078121878.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/47877943840.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/vufesalelil.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/gevatasexivuwogi.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/sujokavizotetemusegujesu.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/zakobe.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2295517e331a56e89a84c182e8ad4bfd/dozanowafosobux.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/tipofopiresivetu.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/lavumasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+ndk+in+androidPDF 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_off0000b755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB755 19032 bytes
SHA-256: d0c0ab56532da6509de5bac3c491001cb98dd3cd381c95a0fbe45370eb2ce60e
font_01_sfnt_off0000e8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10107 10252 bytes
SHA-256: 850f17428cbc73b31911746824b4aedf24bc5f42904b5c6d8b01c1e116ab34e0