Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b41059e4daad9d…

MALICIOUS

PDF

79.4 KB Created: 2021-04-01 01:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6cabc700c7ad6e2c7ff7b728c1065d26 SHA-1: 71374ed029f5ab182af8c2f77e0a523692b0f5b0 SHA-256: d7b41059e4daad9dfece5402ed8f4dd13b662347f404e4a4ba7143e59f193852
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to deceive users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to search results, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://zajinet.ru/award?keyword=princess+saudi+arabia+book+pdf PDF link annotation
    • http://thelandofbadideas.com/madosubebogutukuxazawolog4qno.pdfIn PDF document text
    • http://xavubizuj.22web.org/cheeni_kum_full_song.pdfIn PDF document text
    • http://romabeveseruzor.22web.org/gartner_report_on_cloud_security.pdfIn PDF document text
    • http://edevletorg.com/farm_to_factory_new_englandrlpdy.pdfIn PDF document text
    • http://mamunetosi.iblogger.org/82916274577.pdfIn PDF document text
    • http://kuzakub.22web.org/how_to_create_photo_book.pdfIn PDF document text
    • http://healthbeauty24.online/amsoil_dealer_price_listwu0or.pdfIn PDF document text
    • http://fotonagosuslugi-01.space/mechanical_estimation_engineer_interview_questions_and_answers3r832.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://goramoxoxikaju.epizy.com/metafsica_aristteles_reale.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/fadifafujobeb.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/82457453035.pdfIn PDF document text
    • http://mulotuzasokafo.epizy.com/what_is_c-flex_on_a_cpap_machine.pdfIn PDF document text
    • http://rogidisili.rf.gd/rozavorewulovufamo.pdfIn PDF document text
    • http://zunebafovako.epizy.com/sheet_metal_gauge_thickness_in_mm.pdfIn PDF document text
    • http://vufobaratoja.epizy.com/19020661600.pdfIn PDF document text
    • http://fijudixisofuzat.rf.gd/osteoporosis_colombia.pdfIn PDF document text
    • http://jifupupuf.epizy.com/nowinetosotaduwajiti.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/outlook_app_android_activesync.pdfIn PDF document text
    • http://wadokeg.epizy.com/gizamilikesugegafu.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/juvizeriwejuv.pdfIn PDF document text
    • http://vijamutekaga.rf.gd/60486599423.pdfIn PDF document text
    • http://domusas.rf.gd/58799864247.pdfIn PDF document text
    • http://balubusepebibi.rf.gd/61147111849.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_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 5320 bytes
SHA-256: d5857f56106b641d772055923e05a96de456f3864ddd900055df7cf2bea19fdf
font_01_sfnt_off0001089d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 11868 bytes
SHA-256: 9deb71eab94e526573b0492560ba966543726e8204e7bde0e58bd691014d00e1

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