Malicious PDF — malware analysis report

Static analysis result for SHA-256 10789600b9549fac…

MALICIOUS

PDF

92.6 KB Created: 2021-02-27 12:29:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 80964128b7ce7f01b8c50d6ddeb4f9f0 SHA-1: f633410822d30a273566ef5ab4e92df0f8b7daa9 SHA-256: 10789600b9549fac6e27ffb47397b0071893cadae8e82f8cdc8dcbccba17fa88
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, a common tactic for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://soxebez.ru/123?utm_term=introduction+to+statistical+machine+learning+christfried+webers+pdf PDF link annotation
    • https://cdn.sqhk.co/romilononove/DUclifu/3d_maze_game_pc.pdfIn PDF document text
    • http://aazzzry.space/77627084355qpihx.pdfIn PDF document text
    • https://poxolegap.weebly.com/uploads/1/3/1/0/131069824/rizerefewos.pdfIn PDF document text
    • http://zuregazezoral.mygamesonline.org/siroxewetigigipiviliwidi.pdfIn PDF document text
    • http://vodaxuf.iblogger.org/auriol_weather_station_4-_ld4437-_1_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450513/normal_601f579b692de.pdfIn PDF document text
    • http://binadof.iblogger.org/wasonijewi.pdfIn PDF document text
    • http://udilische.club/16727429207rxybe.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/is_the_texas_driving_test_hard.pdfIn PDF document text
    • http://sevulow.22web.org/brother_2270dw_printer_manual.pdfIn PDF document text
    • https://dodapoxole.weebly.com/uploads/1/3/1/3/131398067/9207909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415331/normal_601ab356a0617.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://surofavuvaxono.epizy.com/jovewewidaj.pdfIn PDF document text
    • http://tufuripisaren.epizy.com/4885646185.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_off000125be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BE 5736 bytes
SHA-256: 019ffd9827ecdd0817c8122d895457d1c6f8f4127899ce286ce1a250b5be3db7
font_01_sfnt_off00013926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13926 14620 bytes
SHA-256: 82fba4e46ada8087a6a218b2b864134aafa609d7d0beaf1be55d2a74274b4da0

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