Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b8c9537ddf8187…

MALICIOUS

PDF

75.3 KB Created: 2021-03-08 16:47:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9422244f71424c8a9de9dbfee6dad685 SHA-1: 28d8b32f781fb827e7865f784472367721e8e332 SHA-256: b8b8c9537ddf818764faced9c697ea832a3ed38a0bdef7eacfdbb1ef676a4480
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-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://mezovuduw.ru/wix?keyword=ikea+return+without+receipt+reddit PDF link annotation
    • http://baranaydin.org/vezadonovugurezekewewirusq5vo8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407747/normal_5ffff6b715bfb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407991/normal_5fc77ab05b447.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368951/normal_60001fb2e745f.pdfIn PDF document text
    • http://dhl-order.info/likasileu5hq3.pdfIn PDF document text
    • http://50offstore.pro/canon_eos_photo_editing_softwaregrac0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414339/normal_6015dc9906a17.pdfIn PDF document text
    • http://sehq.xyz/91617208381i452j.pdfIn PDF document text
    • http://card2card.live/garmin_edge_520_v_530mobx5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420927/normal_601b2ee11c7f5.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/buxoparadazegu/29721440286.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/765d504f-d89e-4aaf-ba02-a33ec106dfa7/puduwifuvovosefukesago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd2f0f6b-dbc7-4bc2-8cb3-43288677d31b/douglas_moo_romans_commentary.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/angular_2_local_variable_in_template.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/guvitik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6416a6f4-5837-4d6d-92ac-a700c4dac86e/c_language_compiler.pdfIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_ab1b11e4d393415a91e5644f83aa7a9e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e72ba24-0938-471b-9497-bf76ba3733c0/windows_10_download_for_pc_free_full_version_32_bit.pdfIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_c0a016253b154d5ebec5838662574ba4.pdf?index=trueIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_78b22a4c25a84bd7bd4af26e7cc730ff.pdf?index=trueIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_d17963412f32446ea7a0a88194a1a503.pdf?index=trueIn PDF document text
    • https://a1d3e036-d9a1-4be1-9d2f-eedbb581cb22.filesusr.com/ugd/3ce946_b0904ad6776946cdb912558a6e022d04.pdf?index=trueIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_6374c27a2ad84817a9e4710e7f77fe74.pdf?index=trueIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_784d7feba1ff49e889da601dd150cfcf.pdf?index=trueIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_473c7dd1ff324f7d86fd6a00c8cdf287.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_off0000eb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4A 5044 bytes
SHA-256: 37f34626884f6cb044efaa16441953efccf127196c629cd225b9362446132268
font_01_sfnt_off0000fc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC81 10228 bytes
SHA-256: 4a2f090bc6e3a64965f6ed0dd73f4b528079e4bdf19144c76004ef8b24ee5042