Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e8e853eff5ce48…

MALICIOUS

PDF

88.3 KB Created: 2021-03-13 16:07:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 5865f188590fd2713322b3dc31e9f0e2 SHA-1: 468b0a04e37dcb2d84621d4181423b29424aa516 SHA-256: 91e8e853eff5ce4834c094391a46f598f15f510f3a852bea10920cae03e33854
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. The embedded URL `https://xajibur.ru/strik?utm_term=remington+870+express+tactical+pistol+grip%252Fstock+combo+18.5+barrel` suggests a phishing or malware distribution lure, potentially related to the document's content. The presence of multiple external URIs and link farm heuristics further supports the malicious nature of the document.

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://xajibur.ru/strik?utm_term=remington+870+express+tactical+pistol+grip%252Fstock+combo+18.5+barrel PDF link annotation
    • http://posadukik.getenjoyment.net/mulewebapiguzipitikivoru.pdfIn PDF document text
    • http://fosipuzo.mypressonline.com/les_causes_de_la_crise_anglophone_au_cameroun.pdfIn PDF document text
    • https://cdn.sqhk.co/felinavaw/aL96gf2/youtube._com_activate_fazer_login_xbox_360.pdfIn PDF document text
    • https://cdn.sqhk.co/nugilatunu/ghfjjhb/music_notes_names.pdfIn PDF document text
    • http://kevebofuru.medianewsonline.com/certificat_de_cession_vhicule_remplissable.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/gfjb19N/mirutefuki.pdfIn PDF document text
    • https://cdn.sqhk.co/serojimo/y9jgfP6/can_i_learn_to_box_at_home.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/how_to_open_paint_using_run.pdfIn PDF document text
    • http://koxivesuvif.mypressonline.com/badigukefitasaki.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/musab.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzinirumawe/gwMqc5u/neo_geo_mvs_games_download.pdfIn PDF document text
    • http://zokamojuzaxoda.22web.org/easy_english_conversation_questions.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/74262403899.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vukanaxugosazed.rf.gd/how_long_does_evod_battery_last.pdfIn PDF document text
    • http://logapazop.rf.gd/dreams_from_my_father_full_book.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/apa_citation_page_format_example.pdfIn PDF document text
    • http://fugufaza.myartsonline.com/can_american_capitalism_survive_main_ideas.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/rotorua_cinema_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/amazon_audible_app_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/kitchenaid_refrigerator_freezer_light_not_working.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_off0001171d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171D 6192 bytes
SHA-256: 22190279dc3b9eaccc765d45fa0faa8abd81b44a9abf1024c49de98461a7d4a2
font_01_sfnt_off00012c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C38 10696 bytes
SHA-256: 44dee43fbce2511b4c6434cbe43c2642050741e202916c5e25d9f310f99f7068

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