Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77d310ef565c478…

MALICIOUS

PDF

75.7 KB Created: 2021-06-09 14:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9dc0b7399215e444717036fe4345f87f SHA-1: 45a878559d79e395e424aaebb2d8742f41aae17b SHA-256: a77d310ef565c478e6b5ce703e51d8629673b46ae3a665f03ca5672cca0b232d
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded URL `https://archism.ru/pbw?utm_term=progress+report+comments+for+distance+learning` is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to exploit vulnerabilities or trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://archism.ru/pbw?utm_term=progress+report+comments+for+distance+learning PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zanikofepaj.pbworks.com/w/file/fetch/144872697/harley_davidson_parts_and_accessories_catalog_2018.pdfIn PDF document text
    • http://wepadigisita.pbworks.com/w/file/fetch/144879474/58607513015.pdfIn PDF document text
    • http://pulixojesu.pbworks.com/f/9488669484.pdfIn PDF document text
    • http://sojakun.pbworks.com/w/file/fetch/144732168/agfa_isolette_repair_manual.pdfIn PDF document text
    • http://nolumemonip.pbworks.com/w/file/fetch/144526206/como_curar_la_balanitis_de_forma_natural.pdfIn PDF document text
    • http://jowenoxo.pbworks.com/f/administrative_law_in_bangladesh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51acdbe4-87e0-447a-9f4e-66fe7c122d40/what_is_the_portal_system_of_circulation.pdfIn PDF document text
    • http://zuwofig.pbworks.com/f/fukoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcf76bd9-365f-40db-af52-58d7e982c9da/xepalasixej.pdfIn PDF document text
    • http://fodorafirig.pbworks.com/w/file/fetch/144562389/31635408398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71ee863f-0b82-408d-828c-8204b0b07061/21953419843.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5812ab8-aaf5-4971-b505-999c8632ec86/how_to_fix_error_5100_canon_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69a1027f-7998-4492-9b7e-685cccbfe734/23941025125.pdfIn PDF document text
    • http://refarumiba.pbworks.com/f/amman_pattu_tamil_songs.pdfIn PDF document text
    • http://fibonilavi.pbworks.com/f/11486610395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7901d862-cbde-4cf0-a8ae-6c4f30e16bed/graco_contender_65_rear_facing_weight_limit.pdfIn PDF document text
    • http://rijunepupuja.pbworks.com/w/file/fetch/144946494/masonitolupokesupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9a41bec-c844-4772-9128-2bda843ba1bb/regetezosalopesadolatefeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eef7f19-e8af-434f-b604-137ceac0ce13/fiwodenin.pdfIn PDF document text
    • http://magogopowo.pbworks.com/w/file/fetch/144798792/6142714387.pdfIn PDF document text
    • http://fibonilavi.pbworks.com/f/vekitugegorajevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92671a0b-c90e-456b-b08b-47e229037522/new_orbit_sprinkler_valve_leaking.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_off0000ea77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 5476 bytes
SHA-256: ecf0265eac840ab2efaae61ce1488c80a7ff003a6ea8214be813b337493020be
font_01_sfnt_off0000fd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD04 10636 bytes
SHA-256: 40fb5269c2acad54f9b38ffe0a8c35e95ab06dd42fd98a55ecbdca21c525b723