Malicious PDF — malware analysis report

Static analysis result for SHA-256 534b40a82ca000ab…

MALICIOUS

PDF

71.2 KB Created: 2020-11-13 03:46:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f674584925e61a5f3c20bbfe900a4f4 SHA-1: bf78067414065a53bda6d33db0f888d4006e46af SHA-256: 534b40a82ca000abf8979aee05a49c58614ce713ce1d41ddf1102f979e4c2ea3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains including traffset.ru. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs suggest a phishing or link-farming attack pattern, likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/strik?utm_term=clickedu+joan+bosca
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/6592166.pdf
    • https://cdn-cms.f-static.net/uploads/4409098/normal_5faddb81a979e.pdf
    • https://gonupedifi.weebly.com/uploads/1/3/4/5/134524362/xazoletug.pdf
    • https://cdn-cms.f-static.net/uploads/4386086/normal_5f8f773441b02.pdf
    • https://cdn-cms.f-static.net/uploads/4391024/normal_5f9803dc8ea34.pdf
    • https://miremewokar.weebly.com/uploads/1/3/0/7/130738658/gujapokimaje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a02618ec-cd09-4833-a6f8-35d0d870a261/12882071868.pdf
    • https://uploads.strikinglycdn.com/files/7c7e6291-bba5-42aa-8e40-d80726fc4cee/ralph_grimaldi_discrete_and_combinatorial_mathematics_solutions.pdf
    • https://uploads.strikinglycdn.com/files/f136eca0-ac9f-44be-a536-be25dbb92058/hp_color_laserjet_pro_mfp_m281fdw.pdf
    • https://uploads.strikinglycdn.com/files/8bb1daa6-762d-4bc9-bce5-fc1746a6c53c/68097838661.pdf
    • https://uploads.strikinglycdn.com/files/0bb96723-f42b-4d96-9ae9-a1f2f4758eae/13369950939.pdf
    • https://uploads.strikinglycdn.com/files/57ebb11d-d15b-4287-8db9-7a26b8712d5c/mijedalugizopanal.pdf
    • https://uploads.strikinglycdn.com/files/dc8693c1-4292-4524-a7e5-9b6c81243fc6/mipexaxo.pdf
    • https://uploads.strikinglycdn.com/files/93cad19d-e924-45be-b712-df0205b5fdfa/30038170428.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_off0000dae0.bin
d53e73020f10a0bb32743561e758b175b16910ae8a706c32e0f6d86f9a1f069c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE0 5020 bytes
font_01_sfnt_off0000ec04.bin
07792c5530ff1bd2eba661305a1d8d2ce662c260f7d37be66845e29c13c50e5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 10744 bytes