Malicious PDF — malware analysis report

Static analysis result for SHA-256 58891a3a3fcc0a3c…

MALICIOUS

PDF

79.1 KB Created: 2021-03-29 11:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 94c51bae08794ac9b26d33a04069c710 SHA-1: e95d3aa89a22ca8f414211ca92631d5a34d8a3f8 SHA-256: 58891a3a3fcc0a3c5153e0db1436ddea46c1e3fd353fb3fc8f9aeab27a235bcc
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true malicious destination through a network of redirecting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wix?keyword=meiosis+pogil+packet+answer+key PDF link annotation
    • http://heleogose.online/java_8_free_download_for_windows_64_bitcntkm.pdfIn PDF document text
    • https://cdn.sqhk.co/segisaxa/iaidhg7/idle_theme_park_tycoon_cheats_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450340/normal_6028f4c4bc8ff.pdfIn PDF document text
    • https://cdn.sqhk.co/dimusokobab/GTmjdjj/26969644926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419412/normal_60415c12a44b5.pdfIn PDF document text
    • http://thiswaytovogue.com/oscar_wilde_lounge_menub2o7x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404983/normal_601083d3b1262.pdfIn PDF document text
    • https://cdn.sqhk.co/vopufepivipe/ggSj9WK/40705353865.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493541/normal_5fedd6af68407.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzozuni/Rj5ibuh/82256777611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418185/normal_600ff7d68f549.pdfIn PDF document text
    • http://natur-bio.space/tuvexetegidobadeparitup5ylxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459170/normal_601eeb3a13eb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387581/normal_604f37a3f25e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403817/normal_5ff08d7e1c43e.pdfIn PDF document text
    • https://cdn.sqhk.co/tavolimogid/ghih4je/lamutobapilon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447437/normal_6059cadaae3c1.pdfIn PDF document text
    • http://sikalaporaka.22web.org/bz20_album_free.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/df57a07d-1e99-4c83-916a-5900e70bf519/how_to_write_a_descriptive_essay_about_a_place_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f001d900-53df-4fb5-bb06-9f0fbb264aba/aprende_ingls_cantando_canciones_infantiles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b2e88b8-62a3-46bf-81d4-ff7bbe227814/is_a_revolution_coming_2020_uk.pdfIn PDF document text
    • http://fogivezin.rf.gd/38526924309.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_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 5364 bytes
SHA-256: da97d71c62b8f10080abcfdd307a44778136280d8cec0381d8694e91c168918b
font_01_sfnt_off00010bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD5 10220 bytes
SHA-256: e0f5f98350fb560095ced4a3156391211d9f54d83a416e1ea5761ab50aaa3b1f

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