Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1892da1bf09b233…

MALICIOUS

PDF

78.1 KB Created: 2021-04-17 04:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5c34d156366b682175f27d6bf54db89f SHA-1: 365966765d047fc9d3954185e8e82a61025c3bdb SHA-256: c1892da1bf09b233682175ecb6df6475b8fed605de76e12e1e08517293e02a01
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 0.9996

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://zajinet.ru/strik?utm_term=sp+racing+f3+acro+wiring+diagram PDF link annotation
    • http://velixone.66ghz.com/offshore_fishing_reports_long_island.pdfIn PDF document text
    • https://cdn.sqhk.co/luwibajik/jjqhbhe/grok_learning_answers_python_2018.pdfIn PDF document text
    • https://kagepejipewabo.weebly.com/uploads/1/3/4/8/134871264/256323d852.pdfIn PDF document text
    • https://vejevidumuruje.weebly.com/uploads/1/3/5/3/135302175/fibajin.pdfIn PDF document text
    • http://nupifijaw.getenjoyment.net/active_voice_passive_voice_exercises_all_tenses.pdfIn PDF document text
    • https://jirugewozori.weebly.com/uploads/1/3/4/8/134898712/3599348.pdfIn PDF document text
    • https://guxodobozit.weebly.com/uploads/1/3/4/3/134333536/tovomobijik.pdfIn PDF document text
    • http://kujinatazema.sportsontheweb.net/xukavuketuzajepidopaki.pdfIn PDF document text
    • https://jileninaniwepuz.weebly.com/uploads/1/3/4/7/134771173/b648779d20b.pdfIn PDF document text
    • https://zisatusomet.weebly.com/uploads/1/3/4/8/134872515/185622d5d.pdfIn PDF document text
    • https://jimiwijir.weebly.com/uploads/1/3/4/5/134525211/melojowatotopaxebi.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/idjijhb/libuliwu.pdfIn PDF document text
    • https://wanuzixa.weebly.com/uploads/1/3/1/4/131482886/7106537.pdfIn PDF document text
    • https://pozimetotekiv.weebly.com/uploads/1/3/4/3/134339641/300928.pdfIn PDF document text
    • https://cdn.sqhk.co/xonivozew/hbibzZO/events_in_atlanta_ga_december_2020.pdfIn PDF document text
    • https://rodifeganugupi.weebly.com/uploads/1/3/2/8/132815003/nigadapon.pdfIn PDF document text
    • https://riwipawubo.weebly.com/uploads/1/3/1/4/131453561/e389fe9065db.pdfIn PDF document text
    • https://nuribivavis.weebly.com/uploads/1/3/4/6/134625990/rakakowowiwiwo-nowajidif.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/damit.pdfIn PDF document text
    • https://cdn.sqhk.co/bobavijiwoba/Vibgi6s/rijifavejewujajupesereka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kidogip.epizy.com/13561758826.pdfIn PDF document text
    • http://felubefetixiwu.rf.gd/algebra_quadratic_equations.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_off0000f425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF425 5624 bytes
SHA-256: 941c0791d5eb2c68ac2aee79f523f44251da9a293d100800fdaed35fff4d4c4d
font_01_sfnt_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 10560 bytes
SHA-256: 94079f8b5e5392d3c2c09455f6d05ec8e6eed4fef5113bd8c195e70d35ab3415

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