Malicious PDF — malware analysis report

Static analysis result for SHA-256 b888bbd6f2fc207f…

MALICIOUS

PDF

82.0 KB Created: 2021-03-29 05:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3248968ccfbb9f9a80b269e8f96b4c06 SHA-1: 85a5102c84b895b74b27853f532a078abdaf56a4 SHA-256: b888bbd6f2fc207fb5dbb182ef3eaaa25e395a0526d677323c844f64301be95c
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 0.9988

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://seumenha.ru/award?keyword=bank+math+book+pdf PDF link annotation
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/3219279.pdfIn PDF document text
    • https://pumaxodevuk.weebly.com/uploads/1/3/1/8/131872084/454fbc3c7c.pdfIn PDF document text
    • https://cdn.sqhk.co/linerutinew/ohg0fie/35531934445.pdfIn PDF document text
    • http://summ-green.fun/53957438229ke8yq.pdfIn PDF document text
    • https://naleletilasimoz.weebly.com/uploads/1/3/0/9/130969891/87b4344d2.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/gcKgjTf/off_ice_hockey_shooting_drills.pdfIn PDF document text
    • https://cdn.sqhk.co/levuzivanu/hgECjdG/drift_sports_cars_for_sale.pdfIn PDF document text
    • https://saxetesaw.weebly.com/uploads/1/3/5/3/135301220/dogagubutod.pdfIn PDF document text
    • http://firstreadersclub.com/is_bella_a_good_waffle_makerp7w73.pdfIn PDF document text
    • http://hangookoil.ru/journey_to_the_west_movie_summaryysjy7.pdfIn PDF document text
    • https://detasove.weebly.com/uploads/1/3/4/5/134594091/morawet.pdfIn PDF document text
    • https://kotuposa.weebly.com/uploads/1/3/1/4/131406283/3d9fc21.pdfIn PDF document text
    • https://zagukosi.weebly.com/uploads/1/3/4/3/134314994/1878447.pdfIn PDF document text
    • http://vknacruckalaikov123.xyz/88993111325xir3a.pdfIn PDF document text
    • https://sifuparara.weebly.com/uploads/1/3/4/3/134352995/3630835.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_f4efa4a6043043008e3659afb48b23eb.pdf?index=trueIn PDF document text
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_8720c065c9f3421d8510729723c63e64.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ac0b0fc-7e4a-49a4-8346-d0526718232a/wogotorozubukejipoxubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcfb68b8-ac5f-4f33-9aed-d92d18e54369/37985415952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec1caccd-16ca-444b-9ebd-4d3c01261051/the_girl_with_the_dragon_tattoo_2009_full_movie_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92df79f8-1354-4028-af78-7033742628d5/delizojoravuduwugitat.pdfIn PDF document text
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_850127bb31c04665848c2866ecda2127.pdf?index=trueIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_eca90d33ac17431a90008e1b4bf73dce.pdf?index=trueIn PDF document text
    • https://d12d056d-c16f-42d2-bb36-b12dbd13f8e5.filesusr.com/ugd/a2005d_f7e8caf65f2743f3a26aad66e195b409.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef062709-89ce-41c1-ab62-704f29225dc7/50026865205.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF765 1696 bytes
SHA-256: 815ac22c4013df891c2e235548fe9c3ad2563b223a45b34a5f3894f8e72b9231
font_01_sfnt_off0000ffc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC7 5228 bytes
SHA-256: f42c5167b28a919bf3422e73d0aa3edb72b801bee43a99a337dea1a25b47fe17
font_02_sfnt_off0001116e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116E 12520 bytes
SHA-256: 09025608768fadd92f4da15f662005d51b92cea6ca1a9391fe9c7b554aa77380