Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd8ef0cc6b98ed4…

MALICIOUS

PDF

77.6 KB Created: 2021-04-04 04:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e8834b33ca01cc9bb04965ff38ffaadd SHA-1: d4199d6dfde7de1741d5388c3b7a1391a86cdae2 SHA-256: bcd8ef0cc6b98ed4d997e699495dffa6742e18444c8982ee0d45942658b59dc3
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URL pointing to a suspicious domain, which is likely used to redirect users to a malicious site. The PDF's content and structure suggest it is part of a social engineering campaign to trick users into visiting the linked site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jacksth.ru/strik?utm_term=trimble+access+desktop+emulator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463298/normal_600dc6a630de2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387230/normal_5ff68453cfeef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496586/normal_5fef873189a8e.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/7279523.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416495/normal_601dc084544d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376359/normal_603627d77df37.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/58pjbZe/hku_terra_nova.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404959/normal_6049bdb61fece.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423429/normal_5fd0663a10797.pdfIn PDF document text
    • https://cdn.sqhk.co/wukiratuxazo/jgRhahj/guarantee_cheque_letter_format.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/ZDhchiT/hydraulic_calculation_plate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482407/normal_601e96ef52803.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379726/normal_5fcab95824f08.pdfIn PDF document text
    • https://pimujupaz.weebly.com/uploads/1/3/4/4/134440235/1335197137c967.pdfIn PDF document text
    • https://cdn.sqhk.co/xukigipeduve/gcpFcXS/53011028668.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9f2ecf12-a635-4a49-bf9c-c01c781db294/vertex_vx-150_programming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02256a7f-7fed-47b0-a713-52c9d09ba73b/how_to_convert_a_4-in-1_crib_into_a_toddler_bed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a26a3cb-3f52-46e1-bf1b-0f5366823010/88888745438.pdfIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_a25fa88c01bf436c9d89d1876d3c3a24.pdf?index=trueIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_44d638e0d5434bc59adf3e212b190437.pdf?index=trueIn PDF document text
    • https://b760d8db-9746-4821-aa2b-94c9f806d328.filesusr.com/ugd/26ce45_bb76d66d0748462094347c59458a4393.pdf?index=trueIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_efe35bc7000b48099fd4c7b10c50e611.pdf?index=trueIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_4276ca821a844728a1b5cd4bb870c098.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8333b904-d0ab-40b9-8dbc-c581e6562584/weber_spirit_e-210_best_price.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_off0000e67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67F 5148 bytes
SHA-256: 1e2c4c7382780582e31d6451a0f4de94875983ee3785c8e5935c090dfe926106
font_01_sfnt_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 10204 bytes
SHA-256: bcc7520f3ed0da18520051e911eaef1cc0d21f700629bb5dcda707684b20adc8
font_02_sfnt_off00011af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF0 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2