Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb5c875685f0b63…

MALICIOUS

PDF

81.3 KB Created: 2021-05-30 12:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6cb1d658873839379447ea7fbd306c75 SHA-1: 1aec850c98e1d733aac17a42b6edcf30870ee788 SHA-256: dfb5c875685f0b63bdcadba852d1085dc291da81b0297ae6a4e7a52104928b75
186 Risk Score

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 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://pelibifir.ru/123?utm_term=hyundai+blue+link+remote+start+manual+transmission PDF link annotation
    • https://toroxamaje.weebly.com/uploads/1/3/4/0/134017611/1dacea8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369317/normal_600f59a15dbd5.pdfIn PDF document text
    • https://jovuwimuj.weebly.com/uploads/1/3/0/9/130969820/dulejomuki_lagujalaj_gisubudufej.pdfIn PDF document text
    • https://fevapeju.weebly.com/uploads/1/3/4/4/134468187/8343286.pdfIn PDF document text
    • https://xonovezalewame.weebly.com/uploads/1/3/4/4/134489084/5aaca085ab54a.pdfIn PDF document text
    • https://rafogemi.weebly.com/uploads/1/3/4/7/134754229/9781142.pdfIn PDF document text
    • https://boleturem.weebly.com/uploads/1/3/4/3/134398498/rugurum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466662/normal_601617cb51063.pdfIn PDF document text
    • https://vumevomuw.weebly.com/uploads/1/3/4/3/134335884/7751543.pdfIn PDF document text
    • https://munulokepopat.weebly.com/uploads/1/3/5/2/135297381/wagofalikowulixu.pdfIn PDF document text
    • https://birafuwufejutik.weebly.com/uploads/1/3/4/5/134598964/banel_nogepememize_xavomopadukokez.pdfIn PDF document text
    • https://batidokupofow.weebly.com/uploads/1/3/3/9/133999778/3281572.pdfIn PDF document text
    • https://wimiwimevodozaz.weebly.com/uploads/1/3/0/8/130874111/fb7b2bacfb.pdfIn PDF document text
    • https://makaxifosezopuv.weebly.com/uploads/1/3/4/5/134511124/zupatuwaturibe.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/fc790998-6f95-4423-8c3f-f7b401e755c2/how_to_play_fantasy_football_2020_espn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/538e19fa-3cc3-42f4-be8e-fbbe4063d1ca/walmart_pharmacy_refill_delivery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a97cf737-8d11-47a8-aa62-bedefd546008/44598080312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d977626d-0a3e-43eb-9277-07590a1a4f07/musiwonaputi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18a80148-4483-40eb-a1c4-877418266826/simaxid.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_off0000fc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC78 5236 bytes
SHA-256: d96a3a4eb56620e9b998d24fc34429263b7d651ec6f7e8fa4a0ebc8fb9f80d82
font_01_sfnt_off00010e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E31 11736 bytes
SHA-256: ca867757577e4f8fe668d4f4007e70fb6499925b581e0a127e3c4e5a668be3c3