Malicious PDF — malware analysis report

Static analysis result for SHA-256 905fc3885b159ee4…

MALICIOUS

PDF

79.0 KB Created: 2021-02-24 07:12:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 69e4b6748584632ef5c30d913c365ab6 SHA-1: 600d4eba6ac86c74a5b10eb6aaf55469c93b245d SHA-256: 905fc3885b159ee43cee8606d34663eb96effcc2a4143667d0f92b9fb4191c6d
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a site that may host further malware or phishing content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/wb?keyword=navien%20tankless%20water%20heater%20npe-240a%20parts PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427523/normal_5ff2030ee4cd5.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/bvcl8hF/best_mods_for_minecraft_bedrock_edition.pdfIn PDF document text
    • https://jipofaxinevafud.weebly.com/uploads/1/3/4/3/134350183/b38494.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/aif5mjf/zekosebe.pdfIn PDF document text
    • http://streichpack.online/19158471665631gu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466368/normal_6016dde0bec54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375075/normal_5fef4255c42d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425768/normal_5fdceb89416e3.pdfIn PDF document text
    • http://xsafak.com/angel_of_mine_monica_freeooy4g.pdfIn PDF document text
    • http://dezlice.ru/image_gallery_website_templates_freeomwy7.pdfIn PDF document text
    • https://garasomebopite.weebly.com/uploads/1/3/0/7/130775476/nananepubup.pdfIn PDF document text
    • http://tovelksa.website/57891530985bbvww.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/3qjAZgj/musenomeregi.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/ejjibBY/rexunugakoxafedid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tovajukoxeboder.epizy.com/membrane_structure_fluid_mosaic_model_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/sat_subject_test_dates_19-20.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/rexezonobuvepufa.pdfIn PDF document text
    • http://melumudinev.epizy.com/beginners_guide_to_the_stock_market_uk.pdfIn PDF document text
    • http://kutepiguzusudax.epizy.com/hitachi_washing_machine_10kg_review.pdfIn PDF document text
    • http://gokakotafabap.rf.gd/como_baixar_para_iphone.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_off0000f76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 5484 bytes
SHA-256: 22450229bff3880c6eee1fdc8744d80cf22e1c053fd9ae8a8a9e6f481db66835
font_01_sfnt_off00010a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 10608 bytes
SHA-256: f3b8afeec3bc305fe746d95e16b20410cb637e810ead9dd12a14daa03d8f3bee

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