Malicious PDF — malware analysis report

Static analysis result for SHA-256 486a92d9df7f167f…

MALICIOUS

PDF

68.6 KB Created: 2021-03-12 09:52:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4d3451ecae094d37689885728f4bfb01 SHA-1: 9c5ad90f97855325410a2d87f2effdb4d8468f0b SHA-256: 486a92d9df7f167fb80ab3e0e7df267d6f57d4fb001c4a9e3ca066420ab30959
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 0.9997

Heuristics 6

  • 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.
  • 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://lozipotod.ru/123?utm_term=multiplying+polynomials+box+method+worksheet PDF link annotation
    • https://xonarupitowij.weebly.com/uploads/1/3/4/6/134617661/4205194.pdfIn PDF document text
    • https://joxalazugadono.weebly.com/uploads/1/3/1/4/131437099/7173663.pdfIn PDF document text
    • http://mydenverneighborhoods.com/16447943396btv9l.pdfIn PDF document text
    • https://xawizavikerid.weebly.com/uploads/1/3/4/5/134525990/7348840.pdfIn PDF document text
    • http://persequen.com/mifuzadaxj4z08.pdfIn PDF document text
    • https://valejuti.weebly.com/uploads/1/3/0/7/130739952/toboxopimux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411511/normal_60356c8db9915.pdfIn PDF document text
    • https://nonexivibofopuv.weebly.com/uploads/1/3/4/6/134603010/9896312.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413735/normal_5ff64d85dc3f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402247/normal_5feaf1407daa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374533/normal_6027a2f20a071.pdfIn PDF document text
    • https://kekisadubivef.weebly.com/uploads/1/3/3/9/133986731/324400.pdfIn PDF document text
    • https://letonezesuju.weebly.com/uploads/1/3/1/3/131383444/9dfd3fea8abc.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/ec1ea026-641f-4536-aa33-59950e0dc8a8/art_de_la_guerre_sun_tzu_citation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e4b3a16-fe91-425c-a5b0-6cff637aa623/the_crown_season_5_and_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd65f848-90a5-4a8a-810f-eca5c3d9229d/wapeduwotiwidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b14cf64-6e52-4d33-b9b8-a49814b5e765/what_is_the_point_of_morning_pages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58f99007-6ffb-4778-b3ce-2bae1222bc00/how_to_set_up_gps_on_garmin_instinct.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa5ec486-8272-406d-9e9f-d3427332d68d/pewisewixununedesimixewuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89d1bbb5-1aee-46bd-b9d4-807c9252212f/numawalupokoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/494f56ab-a136-4d78-94b2-de1dd4b07d09/2150882082.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_off0000ce05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE05 5844 bytes
SHA-256: c42435f166b7979659c0b89b94392835912b1b755b50d8f9a50294a91fbdcc28
font_01_sfnt_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 10236 bytes
SHA-256: 4de647db76a667249d0f7993415fe88536b8989ab33b6e03b74f69118dd0dd87