Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf813c540640b64e…

MALICIOUS

PDF

78.5 KB Created: 2021-04-18 23:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 0b43b412766fcb9385c59cf77414c8a6 SHA-1: d9c628961b18341a6bc0e89fc6831a014ff5113e SHA-256: cf813c540640b64ebcd3ce51440a7764e6be8d22feb143e28c609687f988fdb1
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

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://bologen.ru/strik?utm_term=toro+ccr+2000+carburetor+adjustment PDF link annotation
    • http://kiritisivasol.mywebcommunity.org/2254966542.pdfIn PDF document text
    • http://dazomasuw.22web.org/editable_cv_templates_free_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/tokititagiwe/jhboYwU/tags_for_instagram_artists.pdfIn PDF document text
    • http://lukapar.22web.org/rayne_water_softener_manual_rxd.pdfIn PDF document text
    • https://merudaxesu.weebly.com/uploads/1/3/1/3/131383629/minapozuzitowiw.pdfIn PDF document text
    • https://gajuleli.weebly.com/uploads/1/3/1/8/131871701/7098305.pdfIn PDF document text
    • http://daduriwikoniza.22web.org/free_universal_algebra_equation_solver.pdfIn PDF document text
    • http://jafujofefi.iblogger.org/papizud.pdfIn PDF document text
    • https://cdn.sqhk.co/gisepavuv/22jhoji/84261650717.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/cgiidig/ruradunojatax.pdfIn PDF document text
    • http://fibutogu.mywebcommunity.org/togirug.pdfIn PDF document text
    • https://cdn.sqhk.co/mizipudi/giyJYDQ/dream_league_soccer_2019_kits_manchester_united_kuchalana.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/b2jbNQj/63952697664.pdfIn PDF document text
    • http://sokegex.mywebcommunity.org/bearing_size_list.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/52c0d604-465b-4d67-97c9-ecaba0b86ba0/zuzamerolog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/306bb2c0-0221-4013-8856-7fd23887576d/safodavinugasawux.pdfIn PDF document text
    • http://gomojopovin.rf.gd/types_of_buildings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86f6c331-f722-4f48-b13c-2d4f94e95b85/lean_6_sigma_for_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2618fd78-7267-489e-8684-64e1fdb4b5d5/robert_kiyosaki_net_worth_youtube.pdfIn PDF document text
    • http://dijinisefiregot.rf.gd/18692442801.pdfIn PDF document text
    • http://vimozav.epizy.com/gimp_user_manual_free_download.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_off0000f470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF470 5492 bytes
SHA-256: dadd90bb4a8f4fc6580dead186d68c25225cfdf6a12ab49b27774cadc6611661
font_01_sfnt_off00010704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10704 11084 bytes
SHA-256: 502ea205e00164940f6906607f1a1645aeeda5388c564de1f70bb54ac3db2ca1

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