Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e8f5690c1b37cf…

MALICIOUS

PDF

59.5 KB Created: 2020-11-18 01:08:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa3bbcfd49ed3d51906d4c76cdf2fe69 SHA-1: d02be2d815d222d878510239939310aa16da2905 SHA-256: c6e8f5690c1b37cfb7a5166717767bb0ea4931f688fb27c1aa6f3440be223a1d
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?utm_term=dayana+peres+sosa
    • https://cdn-cms.f-static.net/uploads/4391013/normal_5fa1ac63d7c5d.pdf
    • https://mogijoduvide.weebly.com/uploads/1/3/0/8/130814471/691b4f85991.pdf
    • https://cdn-cms.f-static.net/uploads/4375209/normal_5f8e6e238f855.pdf
    • https://kazajiti.weebly.com/uploads/1/3/4/4/134456981/99b7dee2e4.pdf
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/samesuseliju.pdf
    • https://jixiriramoke.weebly.com/uploads/1/3/4/3/134320492/rizuloza-sigubofuzazuliz.pdf
    • https://fasuwilobavofe.weebly.com/uploads/1/3/4/4/134489762/8612289.pdf
    • https://luwinititik.weebly.com/uploads/1/3/4/5/134587042/231e1.pdf
    • https://toxavikosas.weebly.com/uploads/1/3/4/4/134437834/c00b83397083d2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tezude/pefomosavonenumakana.pdf
    • https://uploads.strikinglycdn.com/files/a2b3d109-f09b-4333-ae33-be926c18fd05/map_of_consciousness.pdf
    • https://uploads.strikinglycdn.com/files/419ea969-9ce3-4500-992d-d66454695f9f/87900592068.pdf
    • https://s3.amazonaws.com/viromibukoleliw/zotagokijilal.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_off0000aeab.bin
e1a9901a0e84b642c256d6668854eda9d54e1eeba2af8eac310d06fec907692e
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAB 4880 bytes
font_01_sfnt_off0000bf66.bin
00740d49972a946e2000d9d531719f47b2ca753d366b0b254672544c88e4daef
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF66 10080 bytes