Malicious PDF — malware analysis report

Static analysis result for SHA-256 309c8402095dcce6…

MALICIOUS

PDF

81.3 KB Created: 2021-03-26 18:16:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ecce5cd6ec206d24e1a9098f465eef9c SHA-1: 6606ba9961f5a9805aa46f7339d453c83ccbfd12 SHA-256: 309c8402095dcce6c240423e6401d2bcec38c8801aea08fcd0866a2dfca964b4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to disposable hosting and exhibiting characteristics of a link farm, suggesting a phishing or malware distribution scheme. The presence of 'utm_term' parameters in some URLs further supports the idea of tracking user interactions for malicious purposes.

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://kuzutuzo.ru/123?utm_term=latest+ugandan+music+videos PDF link annotation
    • http://kilijosizujowo.medianewsonline.com/aromatic_heterocyclic_chemistry.pdfIn PDF document text
    • http://turubegu.sportsontheweb.net/simple_past_tense_regular_and_irregular_verbs_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/sekeniti/hhgfj9i/78050051574.pdfIn PDF document text
    • https://cdn.sqhk.co/tifomogoketu/Xhhxhj7/wisasodetixi.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/XVthYid/thrift_stores_nyc_manhattan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372376/normal_5fee0a7a3b061.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/jMgfha6/51858688761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445564/normal_603d2030b970d.pdfIn PDF document text
    • https://cdn.sqhk.co/komajekolino/haDhd1G/500_sudoku_puzzles.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/fasofoxigatafis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fodobapeda.rf.gd/27466168612.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eac2b647-c13b-4fc4-88c4-c16eb8b9f652/mopafirotegijutiteno.pdfIn PDF document text
    • http://tuminexozuvino.atwebpages.com/dibasekozelamoditedozoruf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7642b8df-f386-403b-981a-9ed6acba18f0/how_do_i_connect_my_hp_deskjet_2622_to_a_new_wifi.pdfIn PDF document text
    • http://pepebejawu.epizy.com/conservation_of_momentum_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1913b30-4d8e-4572-a3cc-d3e1f2b1a4b9/botux.pdfIn PDF document text
    • http://vuxebezedigelun.onlinewebshop.net/tazixenilix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3ebeb5b-2a5a-4313-a61d-040992b63cb6/70098455743.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AF 5132 bytes
SHA-256: d8b8222bed622f84446a03e10a6d2094fbdee9574d1f422276a8e801b53652a1
font_01_sfnt_off0000fa24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA24 13036 bytes
SHA-256: 218f055e4d77d3d3a517fd21c46b15ad892bc636450eee8ffece89bbaff350f3
font_02_sfnt_off000123a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A6 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb

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