Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f91ea1b495ded4…

MALICIOUS

PDF

112.9 KB Created: 2021-03-20 23:18:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 46ee4b222e7698e451f2d78a7c7126b5 SHA-1: fde47b6893639b255628d67bc0c94e8c2784e59c SHA-256: 52f91ea1b495ded4dcdf88a89d64ca923d23107499e857caeda19450e41d3680
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm strategy. ClamAV detection and ML classification confirm its malicious nature, likely for SEO spam or phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://leonvi.ru/strik?utm_term=pioneer+avh-x3700bhs+owner%2527s+manual PDF link annotation
    • http://vovodofozufora.iblogger.org/anet_a8_firmware_update_octoprint.pdfIn PDF document text
    • https://dipabuxirakilat.weebly.com/uploads/1/3/1/0/131071076/9449806.pdfIn PDF document text
    • http://reduslim-ufficialesito.site/le_but_goldrattb46xu.pdfIn PDF document text
    • https://givomolakif.weebly.com/uploads/1/3/4/7/134719940/wivusimopegeji_buvixajorol_fitejomopukoxuj_powen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425919/normal_6017a04f1335e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454813/normal_6019f4a92241f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476564/normal_60317575e15b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452154/normal_604ca7fb73c20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426415/normal_604ee44bacdb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490961/normal_60201c6954325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478141/normal_603ba3e0b5ec8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474223/normal_603c460752374.pdfIn PDF document text
    • http://lnstagram-helping.live/can_you_make_sourdough_starter_in_a_bread_machineklzfj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472764/normal_600c16b7e2ca3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://darotevu.rf.gd/20872091339.pdfIn PDF document text
    • http://wunozoviwo.epizy.com/china_gate_chamma_chamma_video_song.pdfIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_9d8ba5549b2e4d1a908ca041f727f22e.pdf?index=trueIn PDF document text
    • http://zoregok.rf.gd/8684311615.pdfIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_b685a813907646b0b7446e80dad565a0.pdf?index=trueIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_4796ddd5146f41e19ca292b1ffb3c241.pdf?index=trueIn PDF document text
    • https://56076a71-1b70-41e8-afe1-d547c394b4ee.filesusr.com/ugd/ab0d05_6a29136ac7e942ca99f56c5a4413b956.pdf?index=trueIn PDF document text
    • http://milatosokalazer.epizy.com/why_does_the_story_start_with_the_father_and_son_playing_chess.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000179a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179A9 5736 bytes
SHA-256: 06a1ed9899e4d08a38794dd1d8ca582624bded5ed6912b034f9e1b547921efcd
font_01_sfnt_off00018d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D2C 12264 bytes
SHA-256: 82ea717ef748e59913f4ea6198ef140258ed96b863b92ee275794889b7e174b0