Malicious PDF — malware analysis report

Static analysis result for SHA-256 f971eed7952e0b87…

MALICIOUS

PDF

80.4 KB Created: 2021-04-25 20:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 14a53eb89ab48e93da6ca9c269c5d1ac SHA-1: 6485fb5641936a759c1a6b81b045a3b988f5f27a SHA-256: f971eed7952e0b87d42bfcdf009591fbdeaaa0a6d98c321ae2d55bed77a1641a
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of numerous external URLs suggest the document is designed to redirect users to potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=best+old+school+hip+hop+bands PDF link annotation
    • http://mujododaziwato.scienceontheweb.net/advantage_and_disadvantage_of_internet.pdfIn PDF document text
    • http://lisuzigerob.mygamesonline.org/15691072849.pdfIn PDF document text
    • https://dusitibepilezu.weebly.com/uploads/1/3/1/4/131437978/dasabiporoz_xojiketitu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413126/normal_600242215e631.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5fd23642cadbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450259/normal_600ebe77c8260.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424040/normal_6017a878a29a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496014/normal_60354ef40e899.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/domilagavogororukora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416653/normal_606c6bbb52cf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382771/normal_5fc9d78d91053.pdfIn PDF document text
    • https://girawosanisab.weebly.com/uploads/1/3/0/7/130740609/fa39a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziwemasux.myartsonline.com/rezulugajinukofaverewe.pdfIn PDF document text
    • http://tosefiwaniw.rf.gd/historical_thinking_and_other_unnatural_acts.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/91761964541.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/what_transmission_does_husqvarna_use.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/electroscope_lab_answer_key.pdfIn PDF document text
    • http://novoniranalisa.epizy.com/donobuj.pdfIn PDF document text
    • http://widamifikifewex.epizy.com/64384892353.pdfIn PDF document text
    • http://bexiponezewan.rf.gd/ansible_playbook_examples.pdfIn PDF document text
    • http://nixetatop.epizy.com/bosquejos_para_sermones_biblicos.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_off0000fcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF1 5256 bytes
SHA-256: 928876147246373bdeaa9cc3d26e4fe7ae1afa4e82cee0e438bf44399e1510c9
font_01_sfnt_off00010ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC3 11132 bytes
SHA-256: 8add76ca004748fc05da033255d455cfa5527e4551751965993f2458d5ea372f

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