Malicious PDF — malware analysis report

Static analysis result for SHA-256 878d69812046fc2f…

MALICIOUS

PDF

88.8 KB Created: 2021-06-07 01:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 470f08b65c88bfd62c1ad579161c117b SHA-1: 462675dd5994a79dd81e5f9cf4e3e7ad381a1aa2 SHA-256: 878d69812046fc2f57121fd650f4275e9134c0a94a8eacb6983ea8f889e87e8a
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically related to phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://catamma.ru/pbw?utm_term=ejemplos+de+algoritmos+sencillos+en+informatica PDF link annotation
    • https://netopanuneju.weebly.com/uploads/1/3/4/4/134493403/206627.pdfIn PDF document text
    • https://geripipo.weebly.com/uploads/1/3/4/3/134371036/7874689.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389582/normal_5fedd683921da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447096/normal_6046987826ed3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452377/normal_5ff4effa6418e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lijunew.pbworks.com/f/how_to_attach_a_multi_page_to_a_word_document.pdfIn PDF document text
    • http://tufukamapaf.pbworks.com/f/bulemakatuzumitida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba7e16ac-3de5-4256-8be6-f4e107ce4fb4/41680473553.pdfIn PDF document text
    • http://goxeguj.pbworks.com/w/file/fetch/144748827/biblical_hebrew_vocabulary_frequency_list.pdfIn PDF document text
    • http://lulimogosan.pbworks.com/w/file/fetch/144509799/marietta_diner_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6087037-eb20-4288-b881-07f67cf7ee89/whats_the_third_season_of_tokyo_ghoul_called.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/761ea360-2508-48ef-8c36-db52ebcfbc53/delonghi_pinguino_3_in_1_portable_air_conditioner_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/030b48cc-19a8-47fb-b6ad-b2f952ab23bc/how_to_vent_a_harman_pellet_stove.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/f/21670432091.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/husqvarna_455_rancher_chainsaw_service_repair_workshop_manual.pdfIn PDF document text
    • http://xegosigex.pbworks.com/f/divisiones_de_dos_cifras_ejercicios_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8e0f19c-8744-4bd7-8ab9-cf921aad0bfb/fopusunakisuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91409cfd-cf35-47e7-8885-4332487e2ef0/95502869668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6353e8d-53ea-4453-af70-9bd73f20a252/pobomovisaxolefuwo.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_off0001150d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150D 5508 bytes
SHA-256: 9569f33f3764135ad99edb81032301a3a459ff72313843b1f46e7f3310f15939
font_01_sfnt_off000127ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BA 13592 bytes
SHA-256: d0be831a479e98adff76e75bffde1d5accd96e54e3e467163693fd0f4a244383