Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a36b7ce57ac0fda…

MALICIOUS

PDF

94.3 KB Created: 2021-02-11 21:39:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e2e7ac5bdea85f454b8d3961328d4a60 SHA-1: 32a6070bd9289ae4566282a256ff07d0f6ff6f67 SHA-256: 7a36b7ce57ac0fda7243652a5c01b10b0856d9a88541f0a70acadf06055bb3cc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and link farms, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely used for phishing or malware distribution. The document body, though heavily corrupted, contains text related to search queries, reinforcing the lure.

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://jacksth.ru/wix?keyword=18+wheeler+games+unblocked+at+school PDF link annotation
    • https://cdn.sqhk.co/jexerigix/lvjevgj/57217439488.pdfIn PDF document text
    • https://cdn.sqhk.co/raxavetaletu/7iaGrid/did_you_know_facts_about_halloween.pdfIn PDF document text
    • https://cdn.sqhk.co/vojofarakiva/agjXWQQ/41029291756.pdfIn PDF document text
    • https://bosaralox.weebly.com/uploads/1/3/4/6/134608385/3055449.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/Bogfjaj/reversionary_rights_transfer_of_property_act.pdfIn PDF document text
    • https://cdn.sqhk.co/wanoposuj/cjdoGGL/many_brick_breaker_3d_apk.pdfIn PDF document text
    • http://rusakova.space/happy_fall_break_memeyg3qt.pdfIn PDF document text
    • https://vepenisa.weebly.com/uploads/1/3/4/3/134339982/4372808.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/igpihxD/63993740420.pdfIn PDF document text
    • https://nasipowo.weebly.com/uploads/1/3/1/3/131383467/fadapadi_femuwusamaxo_panono_nubogezukexe.pdfIn PDF document text
    • http://copyrighthelp.info/comprehension_worksheets_for_kindergartenssb25.pdfIn PDF document text
    • http://reduslim-official.website/algebra_birkhoff_maclane300o2.pdfIn PDF document text
    • https://cdn.sqhk.co/gudopokobipa/wQhficd/munibuju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/android_9_vs_8.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/civ_vi_steam_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/nofaxodopatusijitifikib.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_off0001348c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348C 5800 bytes
SHA-256: 5aef8fb71ef6e7b4fbc9be43c901c6d9bd498b1e4cde0ea64bbda520e1a70da0
font_01_sfnt_off00014834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14834 10472 bytes
SHA-256: f2b272c7dc86be74a9117706a4420b06b74d41d4d5d1f8ffed58b3c4fd383727

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