Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4fdebd05140bce…

MALICIOUS

PDF

65.7 KB Created: 2021-03-07 19:04:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a21e1196ed0a491288c795bc262af0a2 SHA-1: 7c1f86a5964ae46d6226e5aeb63bbe1ed2ee1473 SHA-256: be4fdebd05140bcef4b955bd9ba937390410d24fda5a18956b59aef39e5313f2
156 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 potentially malicious domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers also flagged this file as malicious. The presence of embedded URLs and the heuristic PDF_SEO_LINK_FARM suggest the document is designed to redirect users to external sites, likely for malicious purposes such as credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://ponafet.ru/123?utm_term=sharp+cv-10nh+portable+air+conditioner+price
    • https://cdn.sqhk.co/givesaxi/gcif4ie/sativopometo.pdf
    • https://mitesevutij.weebly.com/uploads/1/3/4/7/134717039/potufekura.pdf
    • https://cdn.sqhk.co/pixazizaze/bOjaUFP/19112018193.pdf
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/1431145.pdf
    • https://cdn.sqhk.co/tifozeborot/cey97e8/tupuganubesavaxulobe.pdf
    • https://cdn.sqhk.co/levowexesu/azhahhm/blue_and_red_computer_keyboard.pdf
    • https://cdn-cms.f-static.net/uploads/4475582/normal_603cb9846fe80.pdf
    • https://xasirazabad.weebly.com/uploads/1/3/4/6/134699738/ririxozagiwetulaz.pdf
    • https://nosodelutota.weebly.com/uploads/1/3/1/8/131857544/466a00d.pdf
    • https://static.s123-cdn-static.com/uploads/4410432/normal_5fcef73619036.pdf
    • https://zojevobe.weebly.com/uploads/1/3/1/1/131163992/rejiludi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jedadokuti/pigagawekorofafaxa.pdf
    • https://s3.amazonaws.com/fadedosi/99452118907.pdf
    • http://sibubixusa.epizy.com/how_to_determine_value_of_baby_grand_piano.pdf
    • https://uploads.strikinglycdn.com/files/cce53537-96d8-42f2-adf2-adc383a36f7f/63019529078.pdf
    • https://uploads.strikinglycdn.com/files/5805b17e-2e65-4859-97e2-bf7dfefdfb6b/horus_heresy_book_review.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_off0000c409.bin
2738d50d7fa3399e91e963fe234d15cae8e02f1b987f08a97c9fb740e0446307
pdf-font-stream PDF embedded font (sfnt) at offset 0xC409 5512 bytes
font_01_sfnt_off0000d6c6.bin
bfdbcb0f55b26dca2335b84e21a871e4fc59959d3724521d10d7f33bbba7ce39
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C6 10280 bytes