Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90c6d9edee4e1cb…

MALICIOUS

PDF

82.6 KB Created: 2020-12-10 12:16:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d07d2bef7449c4caf6373ae2ff96ba4 SHA-1: 1fe1c5440eaa669ef8a8325ab3481dc03fa35768 SHA-256: f90c6d9edee4e1cbbd7eba9f168a29b131b86aad8a9c198378c6e76b90010382
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a mass of external links, with the primary malicious URL being https://traffnew.ru/aws?utm_term=leatherstocking+guide+service. The document body is heavily obfuscated and appears to be a lure, likely to redirect users to malicious content or initiate a phishing attack. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://traffnew.ru/aws?utm_term=leatherstocking+guide+service
    • https://nukofagola.weebly.com/uploads/1/3/4/8/134883999/4129611.pdf
    • https://tadegelu.weebly.com/uploads/1/3/4/7/134734806/b4582527794f89.pdf
    • https://sajofagexureleb.weebly.com/uploads/1/3/4/6/134652103/bekemelizawajad_biridemavamumo_soneke.pdf
    • https://zexafufu.weebly.com/uploads/1/3/4/5/134510694/c1eba809.pdf
    • https://zemodeviwiteg.weebly.com/uploads/1/3/4/3/134351550/6978441.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/726d33eb-fcc9-490b-9d03-5578e619792e/nerasobego.pdf
    • https://s3.amazonaws.com/tetazino/41338980592.pdf
    • https://uploads.strikinglycdn.com/files/6067ae7a-123e-49b9-8f9b-446fabeacd60/71287126761.pdf
    • https://s3.amazonaws.com/jovekus/terukufuwosekop.pdf
    • https://uploads.strikinglycdn.com/files/236bdb46-48b3-4e9f-82a0-4a8598f066e2/2087882678.pdf
    • https://s3.amazonaws.com/sefabe/dynamics_ax_365.pdf
    • https://uploads.strikinglycdn.com/files/cc8af6a3-3134-48aa-97ee-82a30e277b68/thermodynamic_processes_graphs.pdf
    • https://s3.amazonaws.com/xozeb/13430023251.pdf
    • https://uploads.strikinglycdn.com/files/74d0daba-c4d3-456b-b7c8-5453712c6a80/amcor_air_conditioner_user_manual.pdf
    • https://s3.amazonaws.com/tetazino/maternity_leave_application_form.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6ac.bin
fedbe3183e6d31c63822e030816e5b52327db944d303c1866e3ebb56a1550484		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AC 5116 bytes
font_01_sfnt_off00010811.bin
3c24d78845c77be5a3b88e284500bc239c292267477d0bddb1d2402e68869d01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 11416 bytes
font_02_sfnt_off00012ee5.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE5 4324 bytes

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