Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c28d1bf7159193…

MALICIOUS

PDF

91.1 KB Created: 2020-11-18 14:57:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ee12cc1d15938033f5bda222c744c67 SHA-1: 1183e27eaa0454c1d9cbd99a33623e0154f7db72 SHA-256: 49c28d1bf715919329becf1ff69a5d7681aecbaaac9c3996ba9b3c32573b66b0
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, including a primary link to 'traffset.ru' and a link farm hosted on 'weebly.com', suggesting a phishing or content-farming attack. The PDF structure and embedded content indicate it's designed to redirect users to potentially harmful external 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-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://traffset.ru/strik?utm_term=skyrim+se+favorites+menu+mod
    • https://bekefopu.weebly.com/uploads/1/3/4/6/134692172/damagepeva_xedexo.pdf
    • https://cdn-cms.f-static.net/uploads/4403413/normal_5f91714f6751f.pdf
    • https://cdn-cms.f-static.net/uploads/4421970/normal_5f9a887fbfdc5.pdf
    • https://cdn-cms.f-static.net/uploads/4476750/normal_5fb3722d0d6d6.pdf
    • https://cdn-cms.f-static.net/uploads/4479942/normal_5faf01fe01ca8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1af89221-f79c-4a8e-a0df-8fd8b8c06064/9600570315.pdf
    • https://s3.amazonaws.com/zizene/kosulejadaxemakopu.pdf
    • https://uploads.strikinglycdn.com/files/c0cdc2b4-c802-4f78-93f2-c1472510c614/lugapepopudugatuwow.pdf
    • https://s3.amazonaws.com/bubeto/amd_high_definition_audio_device.pdf
    • https://s3.amazonaws.com/midaguvimabof/the_celta_course_trainee_book_vk.pdf
    • https://s3.amazonaws.com/wonoti/25183912701.pdf
    • https://uploads.strikinglycdn.com/files/dc32d3b1-6280-4b56-ad19-c41dfb7cb54d/51939331468.pdf
    • https://uploads.strikinglycdn.com/files/f0db3d78-3500-4458-830b-a958963fc362/26402598310.pdf
    • https://uploads.strikinglycdn.com/files/0b14c4f8-e4d9-4296-b788-291d1912c993/wondershare_video_converter_and_plex.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_off0000fa1d.bin
0d9880a8042659b4f24001639012dee5d150366f2c86cb0180ad208abd3d9851		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 15032 bytes
font_01_sfnt_off00012754.bin
0d1512ec5ed6000e6a08a1622012cc501ed9b84c21a4697b959072ea33247832		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12754 5348 bytes
font_02_sfnt_off0001397e.bin
ff802ea9ddceafefa2868203ff164eb6c63a362cb2c9cee94c138731dc5a7908		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1397E 11236 bytes

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