Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e6b7bb03521915…

MALICIOUS

PDF

77.2 KB Created: 2021-03-23 15:12:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1079e2b2c727e3e2e319d4afb2aa2fb0 SHA-1: f3fb5e14d17154e0cfd97a4292d11ff4c062d0c3 SHA-256: f6e6b7bb03521915d134f72d8041be184e9aa93748869a5e8355fc8b31ac618a
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to disposable hosting and potentially malicious domains like 'midufefew.ru' and 'reassurez-moi-fr.info'. The PDF structure and embedded URIs suggest it's designed to redirect users to external, potentially harmful content, aligning with phishing or malware distribution tactics.

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://midufefew.ru/award?keyword=ideological+conflict+pdf PDF link annotation
    • http://reassurez-moi-fr.info/lone_survivor_gameplayorqj1.pdfIn PDF document text
    • https://cdn.sqhk.co/pidagasew/fjbjjB7/80438329914.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/777196.pdfIn PDF document text
    • https://nirilixurem.weebly.com/uploads/1/3/4/4/134474770/femelumoduvofatuja.pdfIn PDF document text
    • http://megalit-korolev.ru/8309364000jbtz0.pdfIn PDF document text
    • https://cdn.sqhk.co/fikalibumi/jdR0Vjg/arandanos_peru.pdfIn PDF document text
    • http://help-bluebadgecenter.com/gipilidaduruwugekupusouf4er.pdfIn PDF document text
    • http://dexiserabasavo.mygamesonline.org/27033211302.pdfIn PDF document text
    • http://jobs-ingenieur.best/majitutegesam475r.pdfIn PDF document text
    • http://bafakuvim.sportsontheweb.net/how_to_average_percentages_calculator.pdfIn PDF document text
    • http://zonitupupafof.sportsontheweb.net/pdf_split_ubuntu.pdfIn PDF document text
    • http://zokugorevat.mywebcommunity.org/eureka_vacuum_not_spinning.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jinabom/xagigoxabematexosumomiv.pdfIn PDF document text
    • http://pedamodaw.onlinewebshop.net/fujopomazezifose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44074821-0387-49c1-87b6-9ccf95e24af6/reiki_teacher_training_london.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c22114a-2488-44c9-b7e8-2c6cc862e999/volvo_xc90_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e8be0aa-eb58-4abe-b99a-d1319bc4b241/shark_steam_pocket_mop_not_heating_up.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/wavemogijenezodo.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/serato_dj_intro_pour_mac.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_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 4984 bytes
SHA-256: 81712116fc017fa4a559f2fb0ebc497d030fdd24147d82a1ee1982208079af76
font_01_sfnt_off0001044c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044C 10416 bytes
SHA-256: 297467062d92ad03a519044d71e8bd4a87503d790989e9c7aa92b16b510f47d3

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