Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf870842bedd358…

MALICIOUS

PDF

72.2 KB Created: 2020-11-20 08:51:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0db235c0035ef83af6ca69fdd26f5970 SHA-1: 79bb1776c0b60f0c5bfee3bc54d359b37a144045 SHA-256: fdf870842bedd3584446bda8f5ece7d872b2d2193102c73c7e4145f180f5e12b
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are structured to appear as a link farm for live sports events, likely to deceive users into clicking them. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary malicious URL being https://trafffi.ru/strik?utm_term=barcelona+vs+manchester+united+live. The document body is heavily obfuscated and contains non-readable characters, suggesting it is not intended for direct user consumption but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffi.ru/strik?utm_term=barcelona+vs+manchester+united+live
    • https://nitaluba.weebly.com/uploads/1/3/4/3/134348735/zuwaw.pdf
    • https://cdn-cms.f-static.net/uploads/4381737/normal_5fb60c52bd369.pdf
    • https://cdn-cms.f-static.net/uploads/4385413/normal_5f8c55c5d734c.pdf
    • https://miperodijazef.weebly.com/uploads/1/3/4/3/134308013/vibasutapenivepasob.pdf
    • https://cdn-cms.f-static.net/uploads/4379359/normal_5faf8ffe67763.pdf
    • https://cdn-cms.f-static.net/uploads/4388427/normal_5fa746d61e403.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zonebon/96772994363.pdf
    • https://uploads.strikinglycdn.com/files/86a2c9b6-f481-4cbe-ab88-28ec2c6771a4/52519376736.pdf
    • https://s3.amazonaws.com/wupixufekijax/13393373719.pdf
    • https://uploads.strikinglycdn.com/files/03a406b6-d3b9-4e65-a07e-d55e7b369c21/gelimofagifigovere.pdf
    • https://uploads.strikinglycdn.com/files/83563d73-cb9a-4da6-a0a6-122dc266b47d/38948135940.pdf
    • https://s3.amazonaws.com/jefazaxal/recover_yahoo_email_contacts.pdf
    • https://s3.amazonaws.com/kelukakeb/new_super_mario_bros_wii_apk_android.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c852.bin
cbb52481ce94e16f1aa7c1e5556943e0858c32639ae52c58d7d3596933ba349e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC852 3016 bytes
font_01_sfnt_off0000d30e.bin
a0287dda0f3f1ad6f8184ab7d8d764c7a165ee13e92f6eda9c9f09587b24a63e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD30E 5288 bytes
font_02_sfnt_off0000e4d9.bin
7a6c0cc2e8e0c0e7e4f20de5cf3a6120aa49613d38334657b02bfecc5d3d5eb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 2404 bytes
font_03_sfnt_off0000ee60.bin
dd3d3fb5001dd9220f614c4086dc5205f17a6ae4627023d896cb6433f93e9982		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 10696 bytes

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