Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5baec2002d43194…

MALICIOUS

PDF

73.7 KB Created: 2020-12-21 18:26:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a733bbdd70aa743940ea249aeaf8620 SHA-1: 53c755ff9cca244f39e773020682105e0f029079 SHA-256: c5baec2002d431947ae9b31458f3ded9b6f3611f7322e610409e603df4432e3c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated, characteristic of a link farm or SEO spamming technique. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

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-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://trafftec.ru/strik?utm_term=flying+flies+bird
    • https://nolutoxut.weebly.com/uploads/1/3/4/6/134683805/kulurosuretumug-zenumowo-kazevuwafij-tazugujofib.pdf
    • https://xemamipu.weebly.com/uploads/1/3/0/8/130813095/lutawexinejubonap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jafujasiwetid/my_android_restart_again_and_again.pdf
    • https://s3.amazonaws.com/sugosubexez/7694306455.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe04ad3c6ccf69f325610d/1606288558121/zomudedajizulosulo.pdf
    • https://s3.amazonaws.com/wotodedaruzuk/manual_auto_archive_outlook_2013.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5940cb3e0f577146a65f/1606375748730/chaparral_boat_dealer_oklahoma.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdff729ee0f32b8719fd3d/1606287218922/moussu_picchu_guide.pdf
    • https://uploads.strikinglycdn.com/files/e9249016-2e54-4689-82dc-e23e15b92f88/canon_ip1800_driver_windows_10.pdf
    • https://s3.amazonaws.com/felasorarabipis/zesuxurozoputufokuzojat.pdf
    • https://s3.amazonaws.com/xufaxoferugod/amadeus_radio_manual.pdf
    • https://uploads.strikinglycdn.com/files/f8a0831a-b78c-41e1-a3e6-88a80d5c5b83/73567153411.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_off0000e218.bin
b8190b84d05a02e53e96b5be73716d4f603ded436a6871e9c147b6c64874404b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE218 5064 bytes
font_01_sfnt_off0000f372.bin
fb6b3f7e1e5529ccc38d64b549ac7ddc6211406454f28d13bae8dc09b983b56c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 11812 bytes