Malicious PDF — malware analysis report

Static analysis result for SHA-256 460f432e422377d1…

MALICIOUS

PDF

78.1 KB Created: 2021-03-19 21:53:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 08f48f326e92a6ef7519124e42d4dd14 SHA-1: 0f3179b430ff8a3d96c9801e6c4e37323dc6420c SHA-256: 460f432e422377d1d63403f81a67dbcc22f65ebd8d7196755f717069d50046c0
226 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable hosting or suspicious domains, indicating a link farm or phishing attempt. The 'PDF_SUSPICIOUS_LINK_LURE' heuristic specifically highlights invisible links to domains like 'securityofusersdevicesonline.site', suggesting a deceptive tactic to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://botokaw.ru/123?utm_term=happy+birthday+to+you+recorder+sheet+music PDF link annotation
    • https://metekazup.weebly.com/uploads/1/3/2/8/132815755/3b3f21057.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/printable_cipher_wheel_templateh2ug1.pdfIn PDF document text
    • http://italystore.pro/firulutoayn2c.pdfIn PDF document text
    • http://martans.space/ham_radio_deluxe_software_download3ie3w.pdfIn PDF document text
    • https://xofajusas.weebly.com/uploads/1/3/1/0/131069744/jagutovivenaj.pdfIn PDF document text
    • http://insurancesouk.com/72172293955ktckr.pdfIn PDF document text
    • https://kuginipa.weebly.com/uploads/1/3/4/8/134853520/mitojikedim_dopur_zulipexonom.pdfIn PDF document text
    • https://fuwewarudizikip.weebly.com/uploads/1/3/4/6/134644733/toxibe.pdfIn PDF document text
    • http://idealica-italiaufficiale.site/nidedojamuzolanekifirz8sk2.pdfIn PDF document text
    • http://pijirikuzi.iblogger.org/wow_cataclysm_hunter_leveling_guide.pdfIn PDF document text
    • https://lenexemumuvag.weebly.com/uploads/1/3/1/4/131438583/3358587.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_a7f1f1ece77849a494e90549d597eecd.pdf?index=trueIn PDF document text
    • http://gotazuvibidok.epizy.com/animal_science_worksheets_for_1st_grade.pdfIn PDF document text
    • http://bidilud.rf.gd/65095609058.pdfIn PDF document text
    • https://d429d46a-6203-486b-8c9d-ede5597e1383.filesusr.com/ugd/419b00_0af0bc34365949c39170a6d14f9a0787.pdf?index=trueIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_2d327769a4344e1eb02baacd3188c34e.pdf?index=trueIn PDF document text
    • http://wotixoweg.rf.gd/57416875659.pdfIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_97e0004b0ea94961888dd5328fb62b10.pdf?index=trueIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_6a3b84f783fa471c93bfc842d3b3ceab.pdf?index=trueIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_94091fdff82a4d078b84447e4a38f260.pdf?index=trueIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_ee326e9d21db4d64b25ca62d873c6821.pdf?index=trueIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_268583bd870e422e8b83557fbe9e4d84.pdf?index=trueIn PDF document text
    • http://serumisa.epizy.com/85946173703.pdfIn PDF document text
    • https://8319d365-0190-44ee-b2f3-e76f6fd230eb.filesusr.com/ugd/112488_853366e20e124de38abac1cec08db537.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_off0000f4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D9 5484 bytes
SHA-256: 738035d8e6a53c6f160a4934091c819a31a084e717965e672822e6becb3c827c
font_01_sfnt_off00010751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10751 10728 bytes
SHA-256: effca442996fdae8df1d9b774b12ae42603ec38bc3d03fdfa15d9694a47adf4e