Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b15c1f7bb42947e…

MALICIOUS

PDF

91.7 KB Created: 2020-11-22 22:50:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 44502f946bd3d58e599f8675cc311ad6 SHA-1: b943d8783a378c28b27a084134012899b9f1d5a6 SHA-256: 7b15c1f7bb42947e850aac60905224b668eed7cdc7203e884d6a6ef1bf6785ca
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://trafffe.ru/123?utm_term=is+wheat+native+to+the+americas PDF link annotation
    • https://numilobes.weebly.com/uploads/1/3/4/2/134235742/zezuduzarofi-dorimezisiwikev-fezutur-nebowirasugipi.pdfIn PDF document text
    • https://wilubowedawiwo.weebly.com/uploads/1/3/4/5/134528918/dorowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392872/normal_5fa2e3e199015.pdfIn PDF document text
    • https://jogapemufa.weebly.com/uploads/1/3/4/4/134492880/duzizowo.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/c4c0b877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446260/normal_5fbab99c827d4.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/5232f9be-bcf5-4ae9-9fba-5891c067a7a6/21506944821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/413ebe22-316a-472c-b4d7-8c743511234a/wepopitofegana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edbaebdb-49ae-4e3e-9256-106af95d47cf/piviluri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/193afa8f-5859-445b-a240-92c5ba21778c/otis_michigan_offender_search_female.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bb1fe38-76ec-4ad5-8d4c-33270d036ebe/sarasota_yacht_club_membership_dues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7dbfb2b-6077-41ce-add3-ac0770d4353a/mokilixu.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/limoridil.pdfIn PDF document text
    • https://s3.amazonaws.com/sodoxi/mortgage_amortization_schedule_google_sheets.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_off000129df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DF 5096 bytes
SHA-256: 629914d2feaaf0713926fd63137222f32e25863555dd1a4c8d027060c03d5a4c
font_01_sfnt_off00013b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1F 11732 bytes
SHA-256: 5ddc5167335f8dd90d97b015b8688460e8f09cb960639d453bea56393b48851f

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