Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ad55a2e37042a9…

MALICIOUS

PDF

76.3 KB Created: 2021-02-25 02:08:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 919ea6d4751c67a0c1d2a1c9196a1fc0 SHA-1: b55d4c399351c3b47d1c197045a603d5e850d950 SHA-256: e0ad55a2e37042a9fc1d9c5e386d0726ad0fee24f70df6f61a5f08cace7e5ba2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are to PDF files with generic or keyword-stuffed filenames, indicating a link farm or SEO spamming operation. One of the embedded URLs, 'https://jacksth.ru/award?keyword=yard+machine+riding+lawn+mower+won%2527t+start', suggests a lure related to lawn mowers. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8766

Heuristics 4

  • 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 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.
  • 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://jacksth.ru/award?keyword=yard+machine+riding+lawn+mower+won%2527t+start PDF link annotation
    • https://cdn.sqhk.co/xolafunodo/3gfjeVz/carrie_underwood_acm_2020_songs.pdfIn PDF document text
    • https://sarotokatot.weebly.com/uploads/1/3/2/6/132682281/parurel.pdfIn PDF document text
    • https://cdn.sqhk.co/jimikafede/ibVjchj/skater_xl_xbox_one_price.pdfIn PDF document text
    • https://xudinenudomojuv.weebly.com/uploads/1/3/4/3/134356320/e2a19bfea80310.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385011/normal_5fcb514a19391.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470975/normal_5fdf13b9156f9.pdfIn PDF document text
    • https://cdn.sqhk.co/vemosoveveb/fsijjcs/52170746663.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415065/normal_5ffc805ca6e03.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/hhvthfG/empires_and_allies_zynga_wiki.pdfIn PDF document text
    • https://jokinurelebuvet.weebly.com/uploads/1/3/1/8/131856462/3207274.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420743/normal_5ff8ca6387065.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365563/normal_5fc794f416576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457560/normal_601e82e0cdb4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5fd2678e0ffc5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/http_elements._wlonk._com_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/bacterial_transformation_without_heat_shock.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD20 5440 bytes
SHA-256: 9056e0e918cbe4547694a829fd0226520ed481f8a6180b52b28d04f17c79a5c5
font_01_sfnt_off00010f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F91 10476 bytes
SHA-256: b638202465649e2fe1ef3d77574cf7b7e47cc8641c530cfe27fcca921833da75