Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd91719bdc72375c…

MALICIOUS

PDF

69.8 KB Created: 2021-04-04 08:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 22f4c3cc04221efecc928fab40e2364f SHA-1: b3452d11767a9e44aed407d239bbeb7183ac2ccf SHA-256: fd91719bdc72375c0b4a061f89ff2b633442eca9305bf8fcb485e8381d394bff
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=williraye+studio+americana PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426571/normal_5fed9dfb86082.pdfIn PDF document text
    • https://cdn.sqhk.co/musamari/h0jiyie/fibuv.pdfIn PDF document text
    • http://bionatur.space/35529308723tvhgd.pdfIn PDF document text
    • http://nejupike.mygamesonline.org/fernando_botero_biografia.pdfIn PDF document text
    • http://biomanix.best/olympus_om-2s_review1e53c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464735/normal_5febd15c159b2.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/8uLBHtU/zenogesarelekejir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380080/normal_6044ceedde738.pdfIn PDF document text
    • http://lawexape.mygamesonline.org/each_other_vs_one_another_exercises.pdfIn PDF document text
    • http://garant-ritual.online/bose_lifestyle_48_subwoofer_for_salefzi3d.pdfIn PDF document text
    • http://unreguezff.rest/diccionario_ingls_espaol_larousseh9f7d.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/dibevigebobepomogozubotuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447880/normal_5fe529c143179.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456398/normal_604cfa3d7c4ca.pdfIn PDF document text
    • https://cdn.sqhk.co/faxenukev/ra7haif/liluvomejokuse.pdfIn PDF document text
    • http://powerhdniy.space/canon_printer_pixma_mg3650_manualxozae.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/k7hhhfe/life_after_death_album_lyrics.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/fupanabivote/conjunctions_worksheets_for_class_3.pdfIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_73d2cfb05a9d471eae5480c0c49645de.pdf?index=trueIn PDF document text
    • http://fusozevukatamir.atwebpages.com/where_is_the_wps_button_on_verizon_fios_router_mi424wr.pdfIn PDF document text
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_7bd37639df0b47caa65f03d34ceaf00a.pdf?index=trueIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_ba2529dedeed4832851583274c086693.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/7429595934.pdfIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_131dd988f10941409f62efcedcb05b30.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_off0000d2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B9 5200 bytes
SHA-256: 8763456a916738aba8716dd1c254e5ce0594b3b6369ed5a2bcb47ad8684e1c8c
font_01_sfnt_off0000e463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE463 11104 bytes
SHA-256: 8bf2a1fa67ed326617d8ccd0204b83559478925c3d49eb80543ff2cca10fb980