Malicious PDF — malware analysis report

Static analysis result for SHA-256 122165ccbd21b6ab…

MALICIOUS

PDF

77.8 KB Created: 2021-03-14 21:30:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f0bed4785248de6961789d836ae62c30 SHA-1: e807138ac3c796b1a485cddd22df3c1a852d8bcd SHA-256: 122165ccbd21b6ab10f086c747ea2949b6a80a447f7e1ccc247aabc8be2e72c9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to disposable domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the document's purpose is likely to host malicious links or redirect to phishing sites.

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://druttle.ru/strik?utm_term=distributed+systems+book+tanenbaum PDF link annotation
    • http://kuzexamipapoxip.medianewsonline.com/likidabalezitezuwixa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462350/normal_5fe7554b7bb29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385009/normal_600e75e8ea0af.pdfIn PDF document text
    • http://jevafurevozu.mygamesonline.org/aleister_crowley_magick_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_5fdb5b2b30769.pdfIn PDF document text
    • http://fajamad.mypressonline.com/does_neopost_postage_expire.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380383/normal_5ff06b7d53932.pdfIn PDF document text
    • http://zetumitufam.mywebcommunity.org/ncert_class_12_biology_textbook.pdfIn PDF document text
    • http://saporik.scienceontheweb.net/78164547268.pdfIn PDF document text
    • http://tuvurebomiworo.scienceontheweb.net/71353188430.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xenezipulugiji.atwebpages.com/79177357911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2965d37a-2a0e-4b94-8808-ee6d8ed4905f/double_down_saloon_bar_rescue.pdfIn PDF document text
    • https://f867c6cd-7aae-4938-a634-6821dcb48262.filesusr.com/ugd/eb45fa_7e407990b2af4c3a9939bed0cc47deda.pdf?index=trueIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_dbe7ee5e0f9f421c8f486f6346535300.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/catalog_verb_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a0db427-2900-40c1-842d-a3455350ef03/technical_writing_salary_in_india.pdfIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/journal_el_watan_alger_aujourd_hui.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/46836743207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31baa228-f553-4584-b992-ca9ce2d1b338/how_to_play_mastermind.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A6 5124 bytes
SHA-256: f9576bd763f0aa458b482c9b0694120b1b97af3306d8620d8ea4674db7e10a3f
font_01_sfnt_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 10540 bytes
SHA-256: 3a86c6272d33f295921629486cdbb5b7a30a1d8926c74702bf535e3533e88733
font_02_sfnt_off00011bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF6 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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