Malicious PDF — malware analysis report

Static analysis result for SHA-256 4433e7dabeda3b0c…

MALICIOUS

PDF

72.3 KB Created: 2021-05-20 05:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 95687ff118ce62156c26decf86c9f8e0 SHA-1: b546b1de7b3ed37476fb8f146645c8730ac56d34 SHA-256: 4433e7dabeda3b0c36dcb8828f657da47fed6db49cc1fb56747fccbab34d635d
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, designed to host numerous external links under the guise of search results for a book. The primary URL, 'https://lozipotod.ru/strik?utm_term=prasanta+banerji+protocol+book+pdf+free+download', suggests a phishing or malicious download lure. The presence of multiple external links, many pointing to disposable hosting, reinforces the malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malicious content delivery attempt.

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://lozipotod.ru/strik?utm_term=prasanta+banerji+protocol+book+pdf+free+download PDF link annotation
    • https://nifevokore.weebly.com/uploads/1/3/1/4/131437532/segosejusiwelizitula.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/jewefuzakepew.pdfIn PDF document text
    • https://xazonulukobimov.weebly.com/uploads/1/3/2/7/132712199/pipupigataz.pdfIn PDF document text
    • https://jafipununevov.weebly.com/uploads/1/3/0/8/130814040/bugej_xelifabok.pdfIn PDF document text
    • https://vepibasizux.weebly.com/uploads/1/3/1/3/131380915/xaguzetojazamanolawo.pdfIn PDF document text
    • https://vepiniripalur.weebly.com/uploads/1/3/4/2/134235349/vebenixoreku-wejajafeledogo-xuwar-gidaje.pdfIn PDF document text
    • https://begopafisofebe.weebly.com/uploads/1/3/3/9/133997970/9345719.pdfIn PDF document text
    • https://fasexonepagi.weebly.com/uploads/1/3/0/9/130969542/919670.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/xeponodij/letefotodujew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b9bb36b-94ce-4c87-875b-874e5239c410/naxesenin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b046d235-24d8-4e67-9396-a3ea79eea71c/esl_possessive_adjectives_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/nhs_bottle_making_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/89123333695.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/727e110a-f7ba-4b46-8b2c-690362d52fe2/pukazoxole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cbfef3f-3ae0-4549-be25-26c48d829be2/new_novel_nicholas_sparks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7793f01-0032-4dd4-ad7c-ef67bd7b3a34/ap_human_geography_classroom.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/75027977988.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/dixaledozoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8976a81e-3fe4-404f-968f-6992a60a33e5/easy_crochet_slouchy_beanie_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5cb7d4f-81c4-44cc-b624-2c08d4aa7f1d/73184405595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1e2614e-5f21-4c7e-85ad-7070d2a58947/how_to_write_research_paper_ieee_format.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_off0000de0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0E 5524 bytes
SHA-256: 91385cce89828b132b3ceea7ad34d56e36230f0d64213d5b66b897ee95aa6434
font_01_sfnt_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 10144 bytes
SHA-256: e6bed41e56c96c7754e0a9fd5d09f25fef18d5fbeed8514ef3a39fc9283f3cfd