Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e95496e9604339e…

MALICIOUS

PDF

83.3 KB Created: 2021-03-05 15:09:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 3907e8fde96f1b1d83ba8e7acd342b77 SHA-1: e5adccfa2aa2b203069cf7b1f95cca3cf91f41e9 SHA-256: 6e95496e9604339ed7ef4dd260fce47d63d5a1e5b0c906e6e138d2e725babdd5
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan. While no scripts were directly extracted, the nature of the link farm and the presence of external URLs point towards the distribution of malicious content or phishing lures.

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://zajinet.ru/wix?keyword=conservation+of+momentum+problems+worksheet PDF link annotation
    • https://cdn.sqhk.co/xovujiroveg/ge0Exic/61209974162.pdfIn PDF document text
    • https://cdn.sqhk.co/veladaxuzeba/Hi3xfji/bridge_constructor_portal_switch_test.pdfIn PDF document text
    • http://doordash.fun/rovokusasazenafaluvaxokggss.pdfIn PDF document text
    • https://cdn.sqhk.co/dugabolisuma/hdjghd7/discovery_family_go.pdfIn PDF document text
    • http://centerbluebadge.com/suguvugadubexa5kuvh.pdfIn PDF document text
    • https://cdn.sqhk.co/kafekogi/1hjArid/robotics_notes_dash_anime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490974/normal_600a209194f76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452845/normal_5fee49d07a9b4.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/api_510_inspector_salary_in_canada.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/83032781269.pdfIn PDF document text
    • https://cdn.sqhk.co/rogumabutur/ahbijgE/pvp_rank_wow_classic.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pedamodaw.onlinewebshop.net/guitar_fingerboard_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/davujepiwiwuvegivaj.pdfIn PDF document text
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_6ceb125eebfb4e82972710a57638ae05.pdf?index=trueIn PDF document text
    • http://vokesakogo.onlinewebshop.net/como_aprender_ingles_escuchando.pdfIn PDF document text
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_d1c4eb73cbcb48f1ada81ec143352e56.pdf?index=trueIn PDF document text
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_8db392a6afe1429ba29698237608cea7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/onkyo_tx-sr705_remote_control.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/the_entertainer_easy_piano_duet_sheet_music.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/is_homelander_stillwells_son.pdfIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_79be67512e4543548bd7e55fa4b5d2d9.pdf?index=trueIn PDF document text
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_cefd7b4073374869b9fa0efb1a5d69d9.pdf?index=trueIn 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_off0001045e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 5400 bytes
SHA-256: 7266eaaaf6e665aa1cfff951171ff10775ff4e08c8d1e35021724d1d7605d169
font_01_sfnt_off000116a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A1 12804 bytes
SHA-256: 246b764a29b470a47f35ae4ae6578252f98e27b13a9eff7d5a5aa201741a39ab