Malicious PDF — malware analysis report

Static analysis result for SHA-256 878c6c27b668a5f4…

MALICIOUS

PDF

89.9 KB Created: 2021-03-22 01:50:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b12c47478fb8de60bca1724c45b215f8 SHA-1: 9ac8d608a9dec4923e9bce6d125b54d13fef747a SHA-256: 878c6c27b668a5f454d92b434f41fb86058ab722ffd9f3a6df6284838e483f3e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate 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://baarspo.ru/strik?utm_term=modern+trends+in+production+and+operations+management PDF link annotation
    • https://cdn.sqhk.co/zizenozi/jfQQqqW/growing_crops_in_minecraft.pdfIn PDF document text
    • http://benilobodereji.mygamesonline.org/moccasin_pattern_pack.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424364/normal_5fe2acfa242df.pdfIn PDF document text
    • http://vuvodagedene.scienceontheweb.net/where_is_the_thermostat_located_on_a_kenmore_dryer.pdfIn PDF document text
    • http://boost-shop.xyz/what_is_long_run_productionle9ew.pdfIn PDF document text
    • http://hydra.moscow/financial_accounting_and_reporting_cpa_book50y79.pdfIn PDF document text
    • http://itslm.fun/pegatron_ipm41_d3_audio_drivers_for_windows_79jazb.pdfIn PDF document text
    • https://cdn.sqhk.co/nitagalut/FUALijl/zombie_frontier_3_hack_apk_free_download.pdfIn PDF document text
    • http://xalenupom.getenjoyment.net/fotelup.pdfIn PDF document text
    • https://cdn.sqhk.co/lazemowul/pHMQSjb/darasuvoxinobadakoborof.pdfIn PDF document text
    • http://vumutita.22web.org/75178417263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_6047ebe38b417.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388052/normal_5fc9edb7140b9.pdfIn PDF document text
    • http://zanartcc.net/logar4z6y2.pdfIn PDF document text
    • http://myluckywin.site/at_the_cadian_ball_feminismy52rp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369512/normal_5fd70acd7af63.pdfIn PDF document text
    • http://usacreditcheck.info/32821133599e1dtm.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/jvauHnn/nikon_70-_300mm_vr_lens.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xitiwefebulu.rf.gd/wow_classic_dreadsteed_quest_guide.pdfIn PDF document text
    • http://xolilevifiw.rf.gd/what_are_the_four_fundamental_operations_in_mathematics.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_off0001221a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221A 5368 bytes
SHA-256: f8f259e4e1c7487fb5204614922ea8e61a4e15d1a6fed1b47695375af29297a9
font_01_sfnt_off00013451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13451 11248 bytes
SHA-256: 5fccc863fa97e7dd2fe83f3deb05ef3c846331d31f21e98079ae4a06c1a9c4f4

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