Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1e86e50220d064…

MALICIOUS

PDF

84.7 KB Created: 2021-05-22 21:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 832ed01e8750655b5aa9d14319f68bff SHA-1: eba3acab55fd160d464b4024dcf9c17dfe2c868d SHA-256: 3c1e86e50220d064603a0049cf7dcf1f5a9b432a787e7b98e049eaedfa6a526e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded document body text is heavily obfuscated and unreadable, but the presence of external URIs points towards an attempt to redirect the user to potentially harmful 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://lozipotod.ru/strik?utm_term=qu%25C3%25A9+es+emulsi%25C3%25B3n+en+quimica PDF link annotation
    • https://vadewaxuwarivi.weebly.com/uploads/1/3/7/5/137511132/kufis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495246/normal_6045fbec33f01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412173/normal_60013e9987bda.pdfIn PDF document text
    • https://satizuluvom.weebly.com/uploads/1/3/4/4/134481830/zovaf.pdfIn PDF document text
    • https://ziriponu.weebly.com/uploads/1/3/2/6/132696112/73fc4c12ce5.pdfIn PDF document text
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/nuxazajekiwe.pdfIn PDF document text
    • https://jevebuna.weebly.com/uploads/1/3/4/5/134594548/6144490b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444358/normal_601935f576eff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489058/normal_605a61957ae63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447464/normal_6019b10708469.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453337/normal_60063ac04996b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369520/normal_5ffb535a82faf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/02622277-3d2d-44b9-b7db-a04d27f64a5b/89980693715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1f291c7-a3fb-481e-b257-2c278d9844a3/can_you_use_a_black_sheet_for_a_projector.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7217765-5752-4d7b-b477-925c2dfdf559/30596955044.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/savavedoviramagerenen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33404a73-73bc-46fb-82c4-fcc3e591f90e/ps4_remote_play_macos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9be538f5-95ef-4c88-8771-1ee680af34ff/why_is_my_sprinkler_valve_leaking.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/alaska_cruise_ports_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/15707402871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f33c17fd-d04a-4c9c-ac32-75075bf9396a/what_is_the_meaning_of_capitalized_interest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4c7f062-4954-4449-8c80-64fe8d4d226a/4874734270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ff42c6f-eada-4a93-9dff-0815449f95cc/28073664266.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_off00010ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB6 5316 bytes
SHA-256: a78e814d83a2131b69dab938c908542c4358b1a7cb66fc411da4277325b911e2
font_01_sfnt_off00011c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2F 12176 bytes
SHA-256: da402ebc14cf83af2e154c8a43383506d88bae0e54cd99e6ff2e1661719e7ae0