Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe52c97539bd2202…

MALICIOUS

PDF

75.1 KB Created: 2021-02-28 23:03:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f48d7e36fbddeb5a3e4b3f3485dfa145 SHA-1: c64fafd23820c0eed314d0499dce9138c5c27454 SHA-256: fe52c97539bd2202cb1993ac85994ac4ecabd840cf38e15046ac19a7d24c0714
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and utilize UTM parameters, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of social engineering lures designed to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=intro+to+psychology+final+exam+study+guide+pdf PDF link annotation
    • http://kolagozisil.mywebcommunity.org/voxuvupajuwogo.pdfIn PDF document text
    • http://kavelizopepi.mywebcommunity.org/how_to_make_a_storage_bench_from_pallets.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/what_is_worship_of_false_gods.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418566/normal_5fc9e5f32774f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470222/normal_5ff6c055ac840.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/93764809658.pdfIn PDF document text
    • http://pojapusevipuzu.mypressonline.com/78253120612.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/95410043560.pdfIn PDF document text
    • http://luxomozuk.mypressonline.com/harry_potter_2021_movie.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/dell_latitude_e7450_power_connector.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422378/normal_5fdb8e50516f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487432/normal_5ffbc2b65724c.pdfIn PDF document text
    • http://gedadekenoz.mywebcommunity.org/what_is_the_size_of_graco_pack_and_play_mattress.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475194/normal_5fd8da1710ce9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/who_is_lucifers_brother_michael.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/the_bread_bakers_apprentice_bagel_recipe.pdfIn PDF document text
    • http://pasifowon.atwebpages.com/18014727099.pdfIn PDF document text
    • http://megigezorozo.atwebpages.com/2002_ford_explorer_repair_manual_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/acog_preeclampsia_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/59305673579.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_off0000e85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85F 5676 bytes
SHA-256: fee93c44c2d2f73c07a60b9979277f269a43a36d6ed9465ac9e13ebcffdb8748
font_01_sfnt_off0000fb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 10240 bytes
SHA-256: 9a160e3edbe929bf1df27db2d6c4989eedca2bf90625de47556b11aac112107e

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