Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4772f817ac9d04d…

MALICIOUS

PDF

72.9 KB Created: 2021-03-01 18:40:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 5e41c9c320fae1d9c59898417f19169c SHA-1: 54344fa2b601df85bfd580cb00c0ed38378f2510 SHA-256: f4772f817ac9d04df2dfec9388a8f6c4f431ee25b2ac5fbf2fcc803e8e194b81
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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 lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://dafemum.ru/award?keyword=matlab+plot+multiple+lines+for+loop In PDF document text
    • https://cdn.sqhk.co/bijozugetav/OYEjjgg/1261310209.pdfIn PDF document text
    • http://dovogonusiru.iblogger.org/fukexexisomutunib.pdfIn PDF document text
    • https://ligexuvuzi.weebly.com/uploads/1/3/0/8/130814340/3894114.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzufoxo/Eaiayja/68703960510.pdfIn PDF document text
    • https://xodebizig.weebly.com/uploads/1/3/2/6/132681497/ranise.pdfIn PDF document text
    • https://nabebumiz.weebly.com/uploads/1/3/1/4/131452902/mafenerewakub_teligi_wifat.pdfIn PDF document text
    • https://tizevilujiv.weebly.com/uploads/1/3/1/4/131406709/sofufapanaritaleguz.pdfIn PDF document text
    • https://vizifota.weebly.com/uploads/1/3/0/9/130969876/worasulopu_buguxiwufonifud_pasikivazizu.pdfIn PDF document text
    • https://vutajavegev.weebly.com/uploads/1/3/4/0/134040502/2b87da.pdfIn PDF document text
    • http://zofokesagofot.22web.org/vikudivagajil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://maboduxivugiv.rf.gd/diagnosis_and_treatment_of_lyme_borreliosis_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/33125228012.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/winrar_for_macbook_pro_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/princeton_review_mcat_subject_review.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/deepika_malayalam_calendar_2018_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/free_corporate_video_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/stress_fracture_medial_cuneiform_icd_10.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/kendo_scheduler_custom_edit_template_mvc.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_off0000dff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF7 5192 bytes
SHA-256: 3004e75997e2ee9700f1b74bd160abba74e5febe0b7eb890abd468d06e1dfeff
font_01_sfnt_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 10868 bytes
SHA-256: 32cecb65726515aebba1a452fdac1838e54c344a7be3da52cebe0590c6590cd4

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