Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9ddfbe868a0c3b…

MALICIOUS

PDF

121.7 KB Created: 2021-04-01 06:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: cf70ba1035acd60efa6a88bed06eb9da SHA-1: f6d92986b6e1fe99351fbdadacdfcbdccdcf81f7 SHA-256: 7c9ddfbe868a0c3ba6a5dbbed42baf26474292366b212993fe144d61329b6d94
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF documents. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of links, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or direct users to potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://xezojetit.ru/award?keyword=catia+composer+pdf PDF link annotation
    • https://cdn.sqhk.co/widafopaj/fcdijjg/30450879822.pdfIn PDF document text
    • http://wojurimaxab.mywebcommunity.org/kukaromudubiropamipux.pdfIn PDF document text
    • https://cdn.sqhk.co/xogiwusumo/ZDnK3pr/shark_attack_maui_hawaii.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/dYZICCV/xaketodiva.pdfIn PDF document text
    • https://cdn.sqhk.co/gasukatebu/Jii7VhC/hattrick_meaning_in_urdu.pdfIn PDF document text
    • https://cdn.sqhk.co/jobezivozuf/hh8fiim/royal_throne_chair_for_rent_near_me.pdfIn PDF document text
    • http://mitatizizuje.mypressonline.com/internal_audit_plan_template.pdfIn PDF document text
    • https://cdn.sqhk.co/kogoruzojif/lajejak/jolly_phonics_lessons_app_for_pc_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/guxuboru/6iebjhV/29528734457.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatagemi/ByhiiiH/gartner_supply_chain_symposium_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/fjidXBK/pujuxakajo.pdfIn PDF document text
    • https://cdn.sqhk.co/gozawelesutu/4gijjih/83743064840.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://331e17ce-4321-42a7-89aa-067eaa3daeeb.filesusr.com/ugd/6576ad_d0c4ea5a6d5543c99a87436ab0ba18ed.pdf?index=trueIn PDF document text
    • http://babokad.epizy.com/autocad_3d_commands_list_with_examples.pdfIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_0120d6cbe14d465fa2740c877dd8dd7c.pdf?index=trueIn PDF document text
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_79c4397be7424ab5acd9e118003aa5d2.pdf?index=trueIn PDF document text
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_9b65214eac194df9a8ce0ef3a680f2dd.pdf?index=trueIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_6b552e16650a4e539e317502afa63dd5.pdf?index=trueIn PDF document text
    • https://2c91b947-1dd8-401e-ae91-d595f2f75867.filesusr.com/ugd/0af078_82b2f37ddd604532b7d007086e0a92c6.pdf?index=trueIn PDF document text
    • http://kekabifaku.rf.gd/dance_for_me_wallis_sheet_music.pdfIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_d67aaefab64442068f569ab84fa0001b.pdf?index=trueIn PDF document text
    • http://nudovaxatanobul.rf.gd/probability_worksheet_for_7th_grade.pdfIn PDF document text
    • https://cc67bef4-e22e-42fd-bf01-3f02b15f800b.filesusr.com/ugd/080020_6c51c4b468724a1d8dc7380919a0a3a7.pdf?index=trueIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_6a6f8fff00334595bdace4a05075333d.pdf?index=trueIn PDF document text
    • http://rezofegiwuw.rf.gd/62353627733.pdfIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_ae10cd8a9f33410395458e4be7b85824.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC1 51412 bytes
SHA-256: cbfa66dbca69b3fc5bf06035a936a53b4fdc58242dc09e748733888eedfdf21b
font_01_sfnt_off00018ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AC3 5172 bytes
SHA-256: d93d5d8609789c06ae45048207713267d1ff59574fb003701a34c67e5fa119aa
font_02_sfnt_off00019c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C3C 11844 bytes
SHA-256: fef34723f612f3a93e3b9d436d3cbea7b532e790423bfa29a71ba935f01b717e
font_03_sfnt_off0001c366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C366 16160 bytes
SHA-256: 71fec8a3adfe41455811528c654ef740a0d97889ddd19e39e153b04b7507b7f0

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