Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c1917e129536e6…

MALICIOUS

PDF

87.5 KB Created: 2021-03-31 23:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b5874defd70ecddf40da88c72d18638f SHA-1: 25bed3f7fc9a638ea13d980db001dc098852fb80 SHA-256: a1c1917e129536e61ca24445ae5695ede96df4764c3c6fb01e0dd310ce7aea22
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and a primary lure URL related to movie streaming. This indicates a phishing or malware distribution attempt, likely using a link farm to obscure the final malicious destination. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/strik?utm_term=twilight+eclipse+full+movie+free+gomovies PDF link annotation
    • https://cdn.sqhk.co/dabozijide/hjbhqgh/zed_build_mid_s10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413702/normal_60622d34585c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467945/normal_602e6c7e0536e.pdfIn PDF document text
    • https://cdn.sqhk.co/nujobuja/gdhbHgi/jizixemazuritonirubadefef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453532/normal_6025cb2ce42b6.pdfIn PDF document text
    • http://laserisesiseno.getenjoyment.net/48401814854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410448/normal_603934c24b301.pdfIn PDF document text
    • http://vuzuwul.getenjoyment.net/nilitazesew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410717/normal_5fcd56f855651.pdfIn PDF document text
    • https://cdn.sqhk.co/subilikiwi/hhb1mAt/forest_hd_wallpaper_apk_free_download.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/juduwisimikavemuz.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://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_88a8063235974089818d07a86b514ccf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/poulan_p3314_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c263782-6704-4a6b-aa12-910a6a13d7b2/pupafuvoniveded.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51f43aea-a90d-44eb-a13a-7d5ae64a955a/buwisumogevegunebi.pdfIn PDF document text
    • https://c779a0a5-5a96-4308-8c37-720837e0bdd2.filesusr.com/ugd/4f1d02_5128e37f2fdf4583b2ad9b259740282a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sepawi/ziwumozovosodorusizorujuj.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/bergeys_manual_of_determinative_bacteriology_volume_9_free_download.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_off00010b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 5096 bytes
SHA-256: 1c56ef608f7068bbec1656428e33638f4fefb2d9a3850b4795dbc4ea50f95acd
font_01_sfnt_off00011c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C82 11408 bytes
SHA-256: 55642fc439bc5e487ce436cd224d1cd3d05d682de7a5d29f1576e47ec18f6aaf
font_02_sfnt_off000142b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B2 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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