Malicious PDF — malware analysis report

Static analysis result for SHA-256 a356abd7a140c4ed…

MALICIOUS

PDF

73.0 KB Created: 2021-03-23 15:30:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 911ce13f270337f31433ecb448f9aca8 SHA-1: 1f980b6e073581bdf10109e08ef35a2de4c2207f SHA-256: a356abd7a140c4edfb4b292ffb1d767dd32e646b76f28cdb47665690d5a4969d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document is classified as malicious, with high confidence, due to its structure and embedded URLs. It functions as a link farm, directing users to various domains under the guise of providing information on binomial probability distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=how+to+do+binomial+probability+distribution PDF link annotation
    • https://cdn.sqhk.co/gaxudofexal/f3DiGif/kowedulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495040/normal_6059ba1922cce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491686/normal_5fff99824e26a.pdfIn PDF document text
    • https://cdn.sqhk.co/watexoba/hjhwjsc/street_archery_run_ii_master_horse_riding.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/sgfghji/major_league_rugby_2021_season.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393754/normal_6054fa33c6cec.pdfIn PDF document text
    • https://cdn.sqhk.co/sodelaranu/HJSgeic/kigodofokejaluvidepil.pdfIn PDF document text
    • http://gtomishebs.xyz/80118056419ctmw.pdfIn PDF document text
    • https://cdn.sqhk.co/pivugituxi/gcXiege/amc_rent_a_theater_nyc.pdfIn PDF document text
    • http://vitrinachel.ru/9601493201939q6v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378845/normal_60256d19a587a.pdfIn PDF document text
    • http://itdiscounts.pro/sufoperinesanevelabobatn0x6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409826/normal_602a4cb166a85.pdfIn PDF document text
    • https://cdn.sqhk.co/xajevedu/hgfRxe6/monster_energy_race_today.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/jdqfhil/diep._io_best_tanks_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443801/normal_600a1ec3eae1d.pdfIn PDF document text
    • http://muldwych.com/can_you_air_fry_in_a_convection_microwave_ovenvewc3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_c6324766de0e46b8894e45d24faa6845.pdf?index=trueIn PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_d2638d8a9f4f402896d651af4ab95c21.pdf?index=trueIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_c874574e9e3c4547bec2e2cbb0b7c67c.pdf?index=trueIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_62ff558bde774b269e4d616c5943276a.pdf?index=trueIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_dfd8a50aee214b75ba489d7b2d059ddc.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_off0000df34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 5400 bytes
SHA-256: 5ab3760c6b498afe2487a42f02efdcb0375d7e2cd4329f62325dce564e7868d0
font_01_sfnt_off0000f182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF182 10820 bytes
SHA-256: 19e0ca6c324ab3c6565e968884c5de942b32a800dd851e1af5e4790320aedbc3

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