Malicious PDF — malware analysis report

Static analysis result for SHA-256 851c9cf826fe6ea2…

MALICIOUS

PDF

75.0 KB Created: 2021-03-22 15:01:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3268342fcb028599c1b426864943209c SHA-1: c66d0b03f9d91657ebad1ebc0fb232a9ff9ec2f5 SHA-256: 851c9cf826fe6ea22256e3a28bfd445cf9f43edf45cac8e8e45bbc5220cf50a3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to potentially malicious domains, and the PDF structure suggests it's a link farm designed to redirect users. The presence of external URIs and the link farm heuristic strongly suggest an attempt to direct users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=ellen+macarthur+foundation+circular+economy+report PDF link annotation
    • https://cdn.sqhk.co/topazawu/bvrheiO/49142825063.pdfIn PDF document text
    • https://cdn.sqhk.co/rarinuva/jo0OjfE/rijonutuf.pdfIn PDF document text
    • http://leaninrzpd.site/imax_dual_power_b6ac_instructions7286p.pdfIn PDF document text
    • https://cdn.sqhk.co/tedogegez/ifjiqib/22980020295.pdfIn PDF document text
    • http://tortomsk.ru/brihat_samhita_englishr2vhd.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzinipaz/Cuyhejh/messenger_plus_app_not_working.pdfIn PDF document text
    • http://xavukagidasali.iblogger.org/the_danger_of_a_single_story_ted_talk_worksheet_answers.pdfIn PDF document text
    • http://grizhoff.ru/widor5kq52.pdfIn PDF document text
    • http://poverkavoda.website/potepexokufimuzufeva1nege.pdfIn PDF document text
    • http://uber-global.com/51611863604ldgfu.pdfIn PDF document text
    • https://cdn.sqhk.co/revikokelobu/iGgfFxS/paintball_near_me_party.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e57dbf6-d3f5-4877-a071-51b5535bc07a/14798744622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2d477f8-add1-4341-9faf-b24bb69eb1e6/39327152251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03813c35-f001-4cbf-b873-e35238545ec6/400_gramos_harina_a_tazas.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/47179169197.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/match_beginning_letter_sounds_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2907bd5-4134-45ce-9f54-87f05954faeb/60689552877.pdfIn PDF document text
    • http://butozijiko.epizy.com/46922271228.pdfIn PDF document text
    • http://zunimesigo.rf.gd/bsc_nursing_rajasthan_form_date_2019.pdfIn PDF document text
    • http://mexowotevofo.rf.gd/44703515498.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_off0000e7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B7 5276 bytes
SHA-256: f1ed7351759df21cc05718956053052510933307867aef0eb23521f670dbd874
font_01_sfnt_off0000f98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98B 10880 bytes
SHA-256: 19d764ac0adc79c5f96eef276b713d01fc2982bf30e03dc71d8c9d5bb220cd82

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