Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c8ad527be0aeac…

MALICIOUS

PDF

70.9 KB Created: 2021-03-16 23:18:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e921392870112ffbdd110575002f47c6 SHA-1: 7bf2323737199a647be8abf652d4f528f7413f79 SHA-256: b5c8ad527be0aeac3f6220a58344d25c40e4a377e6bb58dfdcd0aa78ce6246ca
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The primary URL suggests a lure related to 'unblocked games', a common tactic for distributing malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/wix?keyword=slope+unblocked+games+76 PDF link annotation
    • https://ziziwatir.weebly.com/uploads/1/3/4/7/134713039/5035061.pdfIn PDF document text
    • https://wesafave.weebly.com/uploads/1/3/4/3/134307961/9953e0.pdfIn PDF document text
    • https://nozojotama.weebly.com/uploads/1/3/4/5/134585139/kadosujirini_xufalagijuxu.pdfIn PDF document text
    • http://lezozopose.iblogger.org/firewall_app_blocker_free.pdfIn PDF document text
    • https://jitogomufe.weebly.com/uploads/1/3/4/5/134588764/gidefuse.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/jgPibgf/90562008805.pdfIn PDF document text
    • https://cdn.sqhk.co/vapezuwe/gjPKjig/descargar_traffic_racer_hackeado_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/geijjf7/power_hover_apkpure.pdfIn PDF document text
    • https://notemuwos.weebly.com/uploads/1/3/4/7/134717082/ronepip_fexef_dijoxemuza.pdfIn PDF document text
    • https://tasiwusod.weebly.com/uploads/1/3/5/3/135351817/waxodume.pdfIn PDF document text
    • https://zibinileder.weebly.com/uploads/1/3/4/7/134748255/9105013.pdfIn PDF document text
    • https://purubagenipobeb.weebly.com/uploads/1/3/1/3/131398544/jegikilitaxigenat.pdfIn PDF document text
    • https://puvugemamoj.weebly.com/uploads/1/3/0/9/130969199/50ea98253eebf8.pdfIn PDF document text
    • https://datotizit.weebly.com/uploads/1/3/4/6/134696706/570270.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kibulirol.rf.gd/55867075969.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/practice_problems_conservation_of_mass_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/mamuvofumuni.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/fosaw.pdfIn PDF document text
    • http://nuzavaxevarap.epizy.com/assembler_en_un_fichier.pdfIn PDF document text
    • http://pazoluno.epizy.com/biomagnetismo_mascotas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC93 5592 bytes
SHA-256: fe91128fc7288cc75a5c16e13563cd539a3db654e0b5599f530dbecce4bbb470
font_01_sfnt_off0000df70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF70 9716 bytes
SHA-256: afb6fadfcafb50f7b893956bae764221430b9ce893c188f69d905bcfe8adaf2d
font_02_sfnt_off0001009e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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