Malicious PDF — malware analysis report

Static analysis result for SHA-256 650606416ba9d95b…

MALICIOUS

PDF

76.0 KB Created: 2021-03-25 01:20:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3a931cda304b27c165288848a05fbcbf SHA-1: b522f4e2ff3171004b24bafb944a1a6b63b25cc2 SHA-256: 650606416ba9d95b84d101b56dc930a05edd2c0e0b66bb32ba96d00f3e5b6ef7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains, indicating a link farm designed to redirect users. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=george+foreman+evolve+grill+system+recipes PDF link annotation
    • http://bluhgang.best/the_fallen_order_xbox_reviewmgtva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413118/normal_6015665b89997.pdfIn PDF document text
    • http://ujjjrrrrr.space/how_to_program_my_rca_tv_remotel8lq8.pdfIn PDF document text
    • http://bestrongbyg.com/samsung_uhd_tv_6_series_55_inch_reviewn0vcx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_6019a6f955d9a.pdfIn PDF document text
    • https://jokokosewel.weebly.com/uploads/1/3/1/4/131437237/sojofipigugaro.pdfIn PDF document text
    • https://wajigigo.weebly.com/uploads/1/3/4/5/134588105/a7bb5570.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/ujco6z5/pinata_apple_substitute.pdfIn PDF document text
    • http://form-lnstagramcopyrightservice.com/41579530669tzc4f.pdfIn PDF document text
    • http://tlgfree.xyz/farexonewibutodadij1cwnt.pdfIn PDF document text
    • http://fodosokidorakig.22web.org/fopalewukowujasolupoki.pdfIn PDF document text
    • http://japamawosoj.mygamesonline.org/26400754915.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/idge4jb/indeed_job_search_muskegon_mi.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/66599098906.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vafukibugaf.epizy.com/aldazida_50.pdfIn PDF document text
    • http://najorenowodume.epizy.com/us_army_combat_uniform_2018.pdfIn PDF document text
    • http://zijiwaras.onlinewebshop.net/44881287537.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_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 5528 bytes
SHA-256: f1684be6cb0390145a8a8e2c5314c5cf32fb5c665a3e31d614cdd3db95262786
font_01_sfnt_off0000fb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 11768 bytes
SHA-256: 36ca392e4e727c3bebae9fc04e48fd2e6e19ea896eb8d18db7bc5f0259c887d8

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