Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2f016be717d7ff…

MALICIOUS

PDF

78.7 KB Created: 2021-03-16 23:07:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 509c2a6309ec1b61d981702765469ce2 SHA-1: 9d4f02aeb92340a0fb35712297f41ed9e54bf2b3 SHA-256: df2f016be717d7ff619eeb0fdeb8281fa3e6aa80198402d8d78d91f2eddf0e9e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and Weebly/Strikingly hosting, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this as a phishing or malicious PDF. The embedded URLs likely lead to further malicious content or phishing sites.

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
  • 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://ponafet.ru/strik?utm_term=how+to+install+rheem+retex+27+electric+tankless+water+heater PDF link annotation
    • https://jabipiduluw.weebly.com/uploads/1/3/4/6/134662585/4347244.pdfIn PDF document text
    • https://kotedeturu.weebly.com/uploads/1/3/1/6/131606402/afa3b9fcb7b3.pdfIn PDF document text
    • https://cdn.sqhk.co/vabadoma/YtMhePf/86151870050.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/hdicChb/16927203436.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/cOiajgc/rush_hour_2_soundtrack.pdfIn PDF document text
    • http://tagaporigowekis.mygamesonline.org/shoprider_streamer_fault_codes.pdfIn PDF document text
    • https://serorufadorulu.weebly.com/uploads/1/3/1/4/131483245/febeguwi.pdfIn PDF document text
    • https://fugurisugo.weebly.com/uploads/1/3/6/0/136086283/badilineb_fobufepesezoz_vololuwarabi.pdfIn PDF document text
    • http://nadefememidep.medianewsonline.com/cengage_chemistry_book_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rasetiwulipu/eghCYha/sans_boss_battle_music_roblox_id.pdfIn PDF document text
    • https://cdn.sqhk.co/tirabipati/BXopjek/21864344888.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4a57fe7-8c6d-410d-a287-29b3d1316075/puziman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b38ae88-dca8-4194-a778-c066c7e36ec4/pudoxejud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f888df05-78e2-40a5-a047-c4163204eb75/the_complete_far_side_ebay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c44fb2ef-fb5a-4fe5-9c9e-3a66fa3f7ac8/micca_speck_g2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9ea461e-af5a-4b74-b3ec-917bc4643556/pezuvidixev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eec0392-593e-4cb2-a279-c43f3944c8bc/radere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d8cd94d-6e39-4232-bde8-cbe0c61dac45/nemipur.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_off0000f60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 5436 bytes
SHA-256: 5d7e95a5699bd3abeb1952f6ae3c6ee59436a7c8e562c3fc1eb6178da9724472
font_01_sfnt_off0001087a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087A 10580 bytes
SHA-256: c06806f8b0ea8b3e964d6e67f5adcd70d352f853d8085a59cbf14b82680ac030

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