Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a17362692576d2…

MALICIOUS

PDF

75.6 KB Created: 2021-03-18 06:53:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3b3071f1f88f61a9e6e30b0138dd98ac SHA-1: 86ead3b819715da6bfbe1891bda6f005eea76138 SHA-256: 05a17362692576d2cf9a58033842ab25c40d8dbbf27d86cbdbedadaf961d1422
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/strik?utm_term=what+is+a+good+hyperbole PDF link annotation
    • http://myluckywin.site/yeh_shenp2qoj.pdfIn PDF document text
    • http://igonlinesupport.com/how_to_prepare_for_health_care_assistant_interviewxps5y.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/28749423203.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391634/normal_5fcf31ef11a66.pdfIn PDF document text
    • http://bloodcraft.online/vitamin_b12_deficiency_treatment_guidelineskefqz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455890/normal_6015afd2a1441.pdfIn PDF document text
    • https://zozelezike.weebly.com/uploads/1/3/4/4/134434207/42a1dce16bc1.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/the_tyrants_tomb_read_online_books_cool.pdfIn PDF document text
    • https://bireguvax.weebly.com/uploads/1/3/0/7/130775683/c5be4e.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/how_to_replace_salt_in_water_softener.pdfIn PDF document text
    • http://tujidal.mypressonline.com/fire_and_ice_by_robert_frost_analysis.pdfIn PDF document text
    • http://vowitufafuzebil.scienceontheweb.net/200_gramos_de_harina_en_ml.pdfIn PDF document text
    • http://hisgohar.site/16650500675owp14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kusababi.onlinewebshop.net/jidapetekopit.pdfIn PDF document text
    • http://moxosutemow.onlinewebshop.net/64585897279.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8ef83ce-f4db-42f0-a6cc-1931887a92e8/81782450596.pdfIn PDF document text
    • http://gitodake.myartsonline.com/88294969978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16090207-6de3-47d2-b567-f1f20f05b1d9/life_science_mcgraw_hill_7th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35c04327-f81b-4409-b701-7eb0f7828b5d/sweat_equity_agreement_sec.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/timex_1440_sports_watch_battery_type.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_off0000e9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A9 5476 bytes
SHA-256: 984f8b94636514ba86140989e83af6b0ac44e8e481d697da473696b0411cf5d2
font_01_sfnt_off0000fc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4F 10836 bytes
SHA-256: 98c0c18de6bd6c584343e25decda915cc2911f605560047c53a8c4719bb004e3

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