Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8803e1d4cca7a7e…

MALICIOUS

PDF

88.9 KB Created: 2021-03-17 01:20:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f8ac5b4fa7c51d2327692b609ffe1e6f SHA-1: 5427a2f3623d6d9b66b57d69f2edcb6e2a3de82e SHA-256: b8803e1d4cca7a7ee2ed6bfa3986859021d4fe7b2bf8e2afc42aa26c12fbbbe7
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 0.9996

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://jumiwimov.ru/award?keyword=telecharger+cours+apprendre+l+allemand+pdf+gratuit PDF link annotation
    • https://cdn.sqhk.co/posogamumut/hgf3Dhd/check_my_walmart_money_card_balance_online.pdfIn PDF document text
    • https://jupepirime.weebly.com/uploads/1/3/4/3/134313464/514ddbdd0.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/djjDhcf/48036274203.pdfIn PDF document text
    • https://juxejiwivila.weebly.com/uploads/1/3/4/7/134713499/ganudogituzolub-kumasararalewan-tegesozaf.pdfIn PDF document text
    • https://bobilemako.weebly.com/uploads/1/3/4/7/134733435/vazuwupi-sutunino-welide-dowijawawesipan.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxofalu/jf7high/84293002163.pdfIn PDF document text
    • http://ziwavabewite.66ghz.com/procreate_lettering_templates_free.pdfIn PDF document text
    • https://cdn.sqhk.co/bilexodofose/fADgj08/88409146655.pdfIn PDF document text
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/4167436.pdfIn PDF document text
    • https://ferateritilew.weebly.com/uploads/1/3/4/2/134265971/gijuvig_zesugemu_duwatugopi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_d7bf21974c554c0e890013048740b35f.pdf?index=trueIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_f0f54d0f96a44a42964abc53f449f512.pdf?index=trueIn PDF document text
    • http://doluguki.rf.gd/28971500739.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_e0762e4c79ec4739bb9e8b3bf74992ad.pdf?index=trueIn PDF document text
    • http://tifupejonebane.epizy.com/25832335997.pdfIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_85d2ba2f26d042e6b3ccf0fe8aba2487.pdf?index=trueIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_142822dc89f343eb9eaa689703ddf7c8.pdf?index=trueIn PDF document text
    • http://xirixoxixewop.epizy.com/uc_browser_handler_apk_free_internet.pdfIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_05c48a8d93bc429086d49b5bca6a863d.pdf?index=trueIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_b1ef9a91510541da813f7a5be79403c9.pdf?index=trueIn PDF document text
    • http://kuviwobabevi.epizy.com/vurem.pdfIn PDF document text
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_48a2ce1df0f64af98788cf18f6376afb.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_off0001178e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178E 5516 bytes
SHA-256: 600d0a4935986254304ca19edbc26272cd8cb91aacba4d9d66c68c1802cb5ec0
font_01_sfnt_off00012a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A21 13448 bytes
SHA-256: a624b6fe40e58673c7e1361cc8fdbe87a986cbb89be38a131195b2bf13c0eb73