Malicious PDF — malware analysis report

Static analysis result for SHA-256 5daa7a14f0806d77…

MALICIOUS

PDF

168.1 KB Created: 2021-06-12 09:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1d8d33a66fc90d1be17908209e4fd23c SHA-1: 0a765a713d423546e2dfd3ce458cd0b8f4b66da3 SHA-256: 5daa7a14f0806d77f86095353da90dea91349d308e31afb461f272a758a6fa88
166 Risk Score

Malware Insights

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

The PDF document contains multiple external links, with one specifically pointing to a resource related to 'physics for scientists and engineers answers'. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to conceal malicious payloads. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://synerhu.ru/pbw?utm_term=physics+for+scientists+and+engineers+10th+edition+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411916/normal_600a9129410be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422133/normal_5fcdfea9523a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475997/normal_5fff657a23aa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489730/normal_6010a71690206.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447085/normal_5fe759bdb014c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448345/normal_605a5ed04d0ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367643/normal_60026bf7c4c93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421062/normal_5ff25c6cd6501.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449417/normal_600dfa9b9bd9d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1dcbc32-02cc-45d8-9f46-45baa9f0a12f/rar_password_unlocker_mac_online.pdfIn PDF document text
    • http://gawalutibig.pbworks.com/w/file/fetch/144908040/blackmart_apk_ios.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/f/beyond_positive_thinking.pdfIn PDF document text
    • http://legesir.pbworks.com/f/zexixugujeliwe.pdfIn PDF document text
    • http://fetinaduv.pbworks.com/f/34378961195.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/f/pokemon_korosu_rom_download.pdfIn PDF document text
    • http://ravowibosu.pbworks.com/w/file/fetch/144474627/download_light_novel_classroom_of_the_elite_bahasa_indonesia.pdfIn PDF document text
    • http://vibasuvezuz.pbworks.com/f/hill_climb_racing_2_mod_apk_unlimited_fuel_and_money_and_gems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da7f295d-9f29-4184-ae26-68ff89e1379e/53889655717.pdfIn PDF document text
    • http://tujelupirobe.pbworks.com/w/file/fetch/145175319/76184781254.pdfIn PDF document text
    • http://zudilazo.pbworks.com/w/file/fetch/144503907/zewodatifeliri.pdfIn PDF document text
    • http://barumena.pbworks.com/f/kgf_amma_song_download_tamil.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000258e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x258E2 5640 bytes
SHA-256: b4c06d8f13ae60c00307e4bd58dcdb4d5ec3eb5b1cb1ee556a26e9fd82915f86
font_01_sfnt_off00026c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26C34 11112 bytes
SHA-256: 4119f7f97a991784d6d988888dcf7fbc7f064d8b0a0b18a7e39075260e28393e

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