Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ed72a13d532a6c…

MALICIOUS

PDF

88.2 KB Created: 2021-05-29 21:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8ead4bd4a0274c82c4b076d5a55e5cb2 SHA-1: 9444662babb0dd355d433435799d83f5cf8b3b38 SHA-256: f4ed72a13d532a6c32ec2efe8b2f0f1c6488c24d222964b6c13966ea2cbdc8db
186 Risk Score

Malware Insights

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

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 0.9990

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://druttle.ru/123?utm_term=netflix+en+laptop+werkt+niet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418970/normal_606c2ce6bc85a.pdfIn PDF document text
    • https://zisupozukubowad.weebly.com/uploads/1/3/4/6/134678668/kovetexukimo-mamilunorugod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393361/normal_602c64f0807a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370533/normal_60501b514a2a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451035/normal_5ffd60c282b59.pdfIn PDF document text
    • https://gupoxebexu.weebly.com/uploads/1/3/4/3/134337811/kewijexekim.pdfIn PDF document text
    • https://rupovopijono.weebly.com/uploads/1/3/4/8/134863796/besuvudit.pdfIn PDF document text
    • https://kuginipa.weebly.com/uploads/1/3/4/8/134853520/7368436.pdfIn PDF document text
    • https://pojikajuruwasi.weebly.com/uploads/1/3/2/6/132695468/genatuzavo_vodejowakog_bazuxufifozo_xibufaladawov.pdfIn PDF document text
    • https://bativajo.weebly.com/uploads/1/3/4/6/134662657/a52c5085369384.pdfIn PDF document text
    • https://tisudarolajese.weebly.com/uploads/1/3/0/8/130813738/kumegilat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483842/normal_603c86a8c1938.pdfIn PDF document text
    • https://lusezatakobav.weebly.com/uploads/1/3/4/3/134352635/4688694.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/818d680a-77d1-4e37-8c01-f9914ca93928/how_much_water_do_i_put_in_my_presto_pressure_canner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25fee751-78b5-4b62-86e6-aa6556f1f7c8/gegikamarujexokiruf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8050b80f-6eb8-4f66-9074-9e64eb650181/82304229434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24cbc699-15bf-4440-b985-9884a9edd995/how_to_turn_on_hp_pavilion_desktop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dc2e884-4505-4cd5-b49e-49e040bac107/graco_magnum_pro_x7_airless_paint_sprayer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a7dad00-347d-4c2d-8168-c17aa13b77b4/google_image_search_api_javascript.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a7f03c-0333-486d-9875-faa78b127c68/61022028550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9875b8e8-7f89-46c5-a318-0754c6deeda9/how_does_race_influence_behavior_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/527e6b09-23fc-4bfa-a157-8209c98b908e/qsc_rmx_850_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9996eccf-0ee5-45de-847c-17cb899bed5f/halex_ladder_ball_assembly_instructions.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10620 4912 bytes
SHA-256: 612cbcde62d28d3478b8eea4533136bec16aeaa02c351ec88ca066b8117eb6c4
font_01_sfnt_off00011705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11705 11376 bytes
SHA-256: 70241e703a287bf678415cdaf6541bdec1eb179e2b43ea7cbd8cf493a0be2e93
font_02_sfnt_off00013d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D60 16148 bytes
SHA-256: 51babe3b44e703ca5a92278b053c112c5c116674d3b708c8e2cb3e4aa6bd9a04