Malicious PDF — malware analysis report

Static analysis result for SHA-256 2086aa9385973b84…

MALICIOUS

PDF

75.4 KB Created: 2021-03-11 09:42:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1feb9ab593d2eff027c6d495c5abd9cc SHA-1: 71162fa289aea1ac1b25040345d26e200b1b3321 SHA-256: 2086aa9385973b84ad81919de712f687debc77feef9d496facbfb7577565aa41
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'Icewind Dale Rime of the Frostmaiden secrets', used as a lure to direct users to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://nipisod.ru/strik?utm_term=icewind+dale+rime+of+the+frostmaiden+secrets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414672/normal_603ed4143beff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374986/normal_603e50b030566.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/tokotowulirar.pdfIn PDF document text
    • http://zazonowipudu.66ghz.com/zesulexeworelajan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369784/normal_5fca8110d121d.pdfIn PDF document text
    • http://babitilakibo.mywebcommunity.org/fenodufilewiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384835/normal_60076ef9cd3d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451945/normal_602178f60a23c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423427/normal_5ffb6f77b92a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/66134419323.pdfIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_11fe69d7268c481e9cc7c0d7d56ed193.pdf?index=trueIn PDF document text
    • http://lokikigufam.epizy.com/66937528270.pdfIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_78e8df0f7dba43699b22e1ec6443f769.pdf?index=trueIn PDF document text
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_f04d72bbc08440b3acf6c038a1e36a30.pdf?index=trueIn PDF document text
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_b13095fa22c948908b12111887f13eb6.pdf?index=trueIn PDF document text
    • http://kepinud.rf.gd/cpt_guidelines_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/owner_financed_car_sale_contract_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/81163094607.pdfIn PDF document text
    • http://fazafowunop.epizy.com/76214496392.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_off0000eb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB24 5292 bytes
SHA-256: 9adf6f165f1ab3d518cb6f428d1097a45fc86eb54d4b373efb066529aa9fbfde
font_01_sfnt_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 10268 bytes
SHA-256: 40c156d01795225a41fefc775fa5f4bb20be3c7c4941f81efc0cc93487918d2d

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