Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed7d2f0b9e9fb2c…

MALICIOUS

PDF

84.5 KB Created: 2021-02-27 20:42:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a61ae5846689ed90036db58bc1122a36 SHA-1: b52e60407434566433c08a0e6de199b54e20babe SHA-256: bed7d2f0b9e9fb2cc6354d41fdadeac45bd4e7c2cc9a9889dc588094fadefd35
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 high likelihood of malicious intent. The document body and embedded URLs suggest a lure to a website, likely for phishing or scam purposes, using the pretext of offering free food. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=where+are+they+giving+away+free+food+today PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391634/normal_60012ac740763.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488135/normal_5ffb2dc1d4993.pdfIn PDF document text
    • https://witokilufixag.weebly.com/uploads/1/3/4/7/134739393/7653987.pdfIn PDF document text
    • https://jebezefekoju.weebly.com/uploads/1/3/4/7/134737834/lalulefatusa.pdfIn PDF document text
    • https://morapunepa.weebly.com/uploads/1/3/1/6/131606469/wexenosa.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/fitbit_flex_2_price_australia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496592/normal_6006b36852456.pdfIn PDF document text
    • http://witotikumuw.22web.org/wodizimesubewimoluwi.pdfIn PDF document text
    • http://sawedes.mywebcommunity.org/ge_low_profile_over_the_range_microwave_white.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/qifiahh/letadik.pdfIn PDF document text
    • https://gipimosikiji.weebly.com/uploads/1/3/5/9/135963651/ximowadu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388283/normal_6038354c484f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nopawalaxuwaw.onlinewebshop.net/what_is_the_best_sound_bar_for_a_vizio_tv.pdfIn PDF document text
    • http://jeduvuvojupan.rf.gd/onn_mini_stereo_system_remote.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/xetodemadosonevexez.pdfIn PDF document text
    • http://namakanexir.atwebpages.com/national_oilwell_varco_mechanical_engineer_salary.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_off00010b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B96 5224 bytes
SHA-256: 71cf9d993e197c4545ca132f6e4e3cad3f9936c0b71475dd5bd6999af630eba6
font_01_sfnt_off00011d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D81 11540 bytes
SHA-256: 9982c857f16648bdc3a4c981a9fd6e00bc4c6396153fe901345fda3f33fc6010

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