Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6874dab5de8c8ff…

MALICIOUS

PDF

67.6 KB Created: 2021-02-20 04:47:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 112ce40198e64b20b1156df3f1ea77d4 SHA-1: 1807693f296a1ed2246a67ccfbec1c21c5b44b58 SHA-256: a6874dab5de8c8ff3849d683081accddbbe984d4485262055656a1600c7a0226
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a phishing and link farm campaign, as indicated by the numerous external links and the ML classifier's high confidence score. The document's content, though heavily obfuscated, appears to be a lure for "unblocked games" to drive traffic to a network of disposable domains and Weebly-hosted PDFs. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests an attempt to manipulate search engine results or distribute malicious content through a large number of linked resources.

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://maypoin.ru/wix?keyword=tyrone+unblocked+games PDF link annotation
    • https://cdn.sqhk.co/vopofuxo/iegg0oX/tibemerileraniroj.pdfIn PDF document text
    • https://gizivesokopupa.weebly.com/uploads/1/3/2/6/132696604/450dc.pdfIn PDF document text
    • https://lewovabarififu.weebly.com/uploads/1/3/1/4/131453312/govatujakob_dugenoda.pdfIn PDF document text
    • https://nesibebinirudeb.weebly.com/uploads/1/3/5/3/135311353/legelixuvikogaxawun.pdfIn PDF document text
    • https://cdn.sqhk.co/wevujawej/Lu7mrid/skins_for_roblox_apk_mod.pdfIn PDF document text
    • https://negedawitadunez.weebly.com/uploads/1/3/4/5/134587096/kexexerakusidafazoxa.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/jeGdjdU/latest_samsung_galaxy_s9_ringtone_length.pdfIn PDF document text
    • https://sinupumu.weebly.com/uploads/1/3/4/8/134893056/fegav_zoxofigabi_fivedigixovuzup.pdfIn PDF document text
    • https://vojerured.weebly.com/uploads/1/3/3/9/133999986/35226a3214.pdfIn PDF document text
    • https://dofuzubakav.weebly.com/uploads/1/3/1/6/131606612/1862816.pdfIn PDF document text
    • https://tidatulo.weebly.com/uploads/1/3/2/8/132815220/gipuruponevozidip.pdfIn PDF document text
    • https://jojobejuw.weebly.com/uploads/1/3/2/8/132815094/jumibukulimumod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kemufare.epizy.com/55963654285.pdfIn PDF document text
    • http://rimamosapike.epizy.com/29794187103.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_off0000cc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9C 5512 bytes
SHA-256: f0217459b753fc8df73f308ec03acc372285018ed8a4e780667eb051d232d6ec
font_01_sfnt_off0000df4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4E 9984 bytes
SHA-256: c4dd93c44744a4d53d737c0edf5ab7e61a14ccdadccee673d58d40a1d58b8016

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