Malicious PDF — malware analysis report

Static analysis result for SHA-256 6814a3c5644c7c92…

MALICIOUS

PDF

70.0 KB Created: 2020-12-15 21:47:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 589fc7e16cc191a7c7aacb8e70adc1c9 SHA-1: 74403f6946d8d39ecef1dd674e45357f7c81b14f SHA-256: 6814a3c5644c7c92767fb6bbf79fd26179664bd6964d354e2c06d1efcba4aab1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous external links, with one prominent URL pointing to a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to 'York rite college regalia' and the wkhtmltopdf application, suggesting a lure to obscure the true malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/strik?utm_term=york+rite+college+regalia
    • https://voziguwotameba.weebly.com/uploads/1/3/4/3/134345279/237228.pdf
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/198855fd.pdf
    • https://kisotupojez.weebly.com/uploads/1/3/4/4/134493444/mupapoja-fomusebosinowed-pofuzu-xasebozaxiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/livivuvuwugeb/nidotitivopevezedikiwu.pdf
    • https://uploads.strikinglycdn.com/files/cfa08de8-e5b7-4aca-8776-1f4cea23ca9c/monitor_gwg_oder_anlagevermgen.pdf
    • https://s3.amazonaws.com/batiku/vetorolaxumamutafewuzatak.pdf
    • https://s3.amazonaws.com/henghuili-files2/nimewulaseku.pdf
    • https://uploads.strikinglycdn.com/files/6ce384ec-9e97-4122-9f77-176ece3e82ee/wemufeme.pdf
    • https://uploads.strikinglycdn.com/files/02f0b7b9-a9fe-4512-9e40-21031f280674/rate_of_chemical_reaction_worksheet_doc.pdf
    • https://s3.amazonaws.com/nafoxuda/virufujabetikede.pdf
    • https://s3.amazonaws.com/jazuravazaguz/famodumatitaromosabitilo.pdf
    • https://s3.amazonaws.com/povodijirig/cub_scout_bear_leader_guide.pdf
    • https://uploads.strikinglycdn.com/files/450dc998-df41-464a-9f7b-0eedea1d80c6/woforaj.pdf
    • https://s3.amazonaws.com/lopazura/deguzidagav.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d354.bin
c67dd348b6d72bba04684e5e9f6914935c71f9d1b7c6ccb4755b9501124cb078
pdf-font-stream PDF embedded font (sfnt) at offset 0xD354 4816 bytes
font_01_sfnt_off0000e3c8.bin
53f7702be6dee5040bf655a121dd6ec8216457b6cb1fa2fbcba9e8c89ee8e590
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C8 11744 bytes