Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c7a565d5439981…

MALICIOUS

PDF

68.2 KB Created: 2020-12-04 04:15:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 038c811fd8a7d1f3a9cc5034d58fcd44 SHA-1: 39d85b43e19d7dfdc970d6867a5a78ba9ef25cd5 SHA-256: e6c7a565d54399813c33610528c3a0d82b29c2313a23f8b341298183ea407174
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8050

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://trafftec.ru/aws?utm_term=inventory+control+management+excel+template
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/6559727.pdf
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/195124.pdf
    • https://gabesusot.weebly.com/uploads/1/3/4/8/134895193/winef.pdf
    • https://vikumeniwexawud.weebly.com/uploads/1/3/0/9/130969440/8823596.pdf
    • https://zomerasojukoluw.weebly.com/uploads/1/3/4/7/134769652/dedokugaru.pdf
    • https://zafimalomaw.weebly.com/uploads/1/3/4/4/134458932/nuriwaxatapepe.pdf
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/b20432e0b766e4.pdf
    • https://tupuzenetuz.weebly.com/uploads/1/3/4/5/134519332/tajiba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/131736df-0255-49ce-b110-5d1233bb759e/wakfu_sram_build.pdf
    • https://static1.squarespace.com/static/5fc28fbed26ff1194f7e5808/t/5fc60fbaeaf37e3b646bd9dd/1606815675767/10075257213.pdf
    • https://static1.squarespace.com/static/5fc101f96609fd0ee791e489/t/5fc23590fa04221c716928e5/1606563216661/dover_sherborn_middle_school_lunch_menu.pdf
    • https://static1.squarespace.com/static/5fc052d83dfdd95b60d21819/t/5fc46a0c3485235c8653ae1a/1606707725088/ring_doorbell_manual.pdf
    • https://uploads.strikinglycdn.com/files/f43e504d-b3e8-4083-b0a4-8c64fb64424b/pedurisejetusa.pdf
    • https://s3.amazonaws.com/bopuxosavubare/65237198819.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee60.bin
64f2e6ce5cca73650ff5d9e441014509c78d11b9efe95ff42426f455868d46ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 5244 bytes