Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c58848df45034eb…

MALICIOUS

PDF

88.0 KB Created: 2021-04-17 06:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 07d315a8595ba7d911a284e5ac600fd2 SHA-1: c9338b9a7c585cc0ff4cf4b33798a554d95e6f1b SHA-256: 6c58848df45034eb25a84db5d177ff905c3194b62b526f343f3aafd41856a26d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' indicating a large number of outbound links. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://fokemale.ru/strik?utm_term=what+is+addie+training+model PDF link annotation
    • http://bimolomazija.22web.org/bollywood_movies_2007_free_hd.pdfIn PDF document text
    • http://regse.website/asgardians_of_the_galaxy_movie_posterlpmfg.pdfIn PDF document text
    • http://opensalon.xyz/843594847547ddv3.pdfIn PDF document text
    • http://mjawebdesign.net/what_is_the_cherokee_tribe_religionu12cs.pdfIn PDF document text
    • http://dazudur.22web.org/analisis_bromatologico_definicion.pdfIn PDF document text
    • http://copyright-helps-team.com/did_the_prince_family_break_upmtztb.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/zifilobesumafi/kofabes.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/92626457275.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/breakup_party_hd_video_pagalworld._com.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/aha_guidelines_stroke_2014.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/sigmund_freud_theory_of_psychosexual_development_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/escape_room_board_game_answers_space_station.pdfIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_80b3cf56822a48198e7c66c84a743067.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gedimuta/89561900548.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/colloquium_report_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/sheets_of_hard_plastic_for_crafts.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/little_learners_day_nursery_ofsted_report.pdfIn PDF document text
    • https://7e574f8b-ef34-4833-8dee-b18f3ac9fc91.filesusr.com/ugd/af8ffd_88b518b51b8249b5846696c818d3518f.pdf?index=trueIn PDF document text
    • http://lawurukipajuxe.rf.gd/whatsapp_app_apk_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/zudazibudeven.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_off00011b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B46 5252 bytes
SHA-256: 539680875fafd6f78becfd9e1c12e9902d36e17e1b5e9a6cd0459f564a28fc1d
font_01_sfnt_off00012cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFF 11148 bytes
SHA-256: c0cd0d70be102d14fb3c720ea696e8ccf6aba81d8d2e211ec610f9a7ebfcac34

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