Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b87791b68bf1824…

MALICIOUS

PDF

70.5 KB Created: 2021-06-13 23:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a0a3ef0763447067250b1863c1d7d79 SHA-1: 50fa1746b04063ccc040544f46ee9526a023e2f7 SHA-256: 2b87791b68bf18243f8d1f676014fbe94b496dc6dcc49df8f124f2c05507a102
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the ML classifier's high confidence further support its malicious nature. No scripts were extracted, but the overall structure and link farm behavior indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://catamma.ru/pbw?utm_term=bash+if+statement+variable
    • https://lozepogapexofa.weebly.com/uploads/1/3/7/5/137518934/kugipirilo.pdf
    • https://static.s123-cdn-static.com/uploads/4379726/normal_5ffe29d7c2b1e.pdf
    • https://rajarajo.weebly.com/uploads/1/3/1/3/131398110/2927710.pdf
    • https://fezagexagowib.weebly.com/uploads/1/3/5/3/135313062/denasamadifokit.pdf
    • https://nexolibevi.weebly.com/uploads/1/3/4/4/134463206/e77f43824.pdf
    • https://cdn-cms.f-static.net/uploads/4393752/normal_6062276f05c3b.pdf
    • https://vomuribo.weebly.com/uploads/1/3/1/6/131607062/vatabebesuwexev_nozovarojow_zowejubifufite_pinozule.pdf
    • https://static.s123-cdn-static.com/uploads/4405654/normal_5fe229e6a5338.pdf
    • https://rixemeja.weebly.com/uploads/1/3/4/7/134711448/gazegowomofibagava.pdf
    • https://cdn-cms.f-static.net/uploads/4493610/normal_602926ef57796.pdf
    • https://cdn-cms.f-static.net/uploads/4415065/normal_606e2ae86a217.pdf
    • https://xadinizojagum.weebly.com/uploads/1/3/4/0/134016813/7969248.pdf
    • https://wikuxokogex.weebly.com/uploads/1/3/1/8/131872144/vakama_xibil_girelolo_xebunene.pdf
    • https://cdn-cms.f-static.net/uploads/4415951/normal_603ab2d4144b5.pdf
    • https://cdn-cms.f-static.net/uploads/4450506/normal_60430670f1b74.pdf
    • https://static.s123-cdn-static.com/uploads/4413843/normal_5fcf4ab419228.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c771e2d4-8827-4a4c-9400-79e0a5b8577e/papas_pizzeria_unblocked_77.pdf
    • https://uploads.strikinglycdn.com/files/ddff820a-b9ab-4af9-aa08-5acba1ca3230/mozav.pdf
    • https://uploads.strikinglycdn.com/files/4a8ea4b2-7ad1-42d4-86c5-2de19c16a11e/36076607982.pdf
    • https://uploads.strikinglycdn.com/files/067b28a2-82c3-41ce-90c4-bb64ab737a4f/paxematezo.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_off0000d5f1.bin
78695b145b74a678264cd517bc6be4199756d61cb83bd9be1414c0c43f0c775e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F1 5256 bytes
font_01_sfnt_off0000e7b3.bin
e24214229db32e502e9a1cc8b84887e108780b475f4133b4146146feac73bb23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B3 10856 bytes

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