Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd76e29dd8ea0cce…

MALICIOUS

PDF

81.1 KB Created: 2021-03-20 00:41:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 208ab6b0155ffe48a27fcc994fdf8e9d SHA-1: 134fa4eabcd7b1559361e22a9769c9dc70ae6473 SHA-256: bd76e29dd8ea0cced95f97c4b35cdfc307e2ff6b6bbc75fafabb5925d74b64bf
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified as a link farm, hosted on disposable domains. The document body suggests a lure related to 'Java programs interview questions and answers for freshers pdf', which is likely a deceptive title to attract clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to distribute further malware through the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pelibifir.ru/strik?utm_term=java+programs+interview+questions+and+answers+for+freshers+pdf PDF link annotation
    • https://cdn.sqhk.co/pefisemise/Kgjumhj/photo_editor_online_free_photoshop.pdfIn PDF document text
    • https://cdn.sqhk.co/sanevujaguda/jfiRHjd/jodizekineruga.pdfIn PDF document text
    • https://cdn.sqhk.co/puwipaneke/NIwGZhb/86717109765.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobuwaxegu/kXR0FFk/free_able_calendar_2019_canada.pdfIn PDF document text
    • https://zupelewelasilag.weebly.com/uploads/1/3/4/5/134594614/173630.pdfIn PDF document text
    • http://zonagareme.getenjoyment.net/all_flip_flop_truth_table.pdfIn PDF document text
    • https://cdn.sqhk.co/xasurila/Egcfvhf/maduripoxipufe.pdfIn PDF document text
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/1332318.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/reptile_and_amphibian_study_merit_badge_answers.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/woduvapomameved.pdfIn PDF document text
    • http://rimarilomikozu.medianewsonline.com/42622298171.pdfIn PDF document text
    • https://piwetidij.weebly.com/uploads/1/3/2/3/132303123/4339212.pdfIn PDF document text
    • https://cdn.sqhk.co/lupananonutu/7AiibU5/tecnologia_da_informao_curso_gratis.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/rusufegamabo-wutunoj-govevoxoz.pdfIn PDF document text
    • https://cdn.sqhk.co/botuvawezej/evcGibt/xejesevufelalepabu.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/STkgfjf/14417892.pdfIn PDF document text
    • https://cdn.sqhk.co/fapewakuw/fhhglUl/92745848773.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lawiferow.myartsonline.com/rofelogedasefileturosaweb.pdfIn PDF document text
    • http://nizofikunatafu.atwebpages.com/novegadarijulupul.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_off0001011f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011F 5692 bytes
SHA-256: db44a0b365dbb06579d017e9f51bc4b61212f6f10010fb32f47247e0b8c57a30
font_01_sfnt_off00011463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11463 10516 bytes
SHA-256: 1303e2e3849de65b216519434cd5450173d850573db4feadecf0f6be633e2b25