Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc21a03762fc6f4…

MALICIOUS

PDF

69.0 KB Created: 2021-03-08 16:43:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0d5d5f716890deebc542c892b72a4b94 SHA-1: d850b441a6832fa85e723fc74e1789b5aee140b8 SHA-256: 6dc21a03762fc6f4f21d06030a6cd0abbd951c5a003131c0c1e86a9b6cc29ac9
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains multiple external URIs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs indicate an attempt to trick users into visiting these sites, likely as part of a phishing or malware distribution campaign.

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://pelibifir.ru/award?keyword=bailar+bailar+line+dance+pdf PDF link annotation
    • http://napufokotipo.getenjoyment.net/natuxo.pdfIn PDF document text
    • http://rijigikesezaga.mypressonline.com/wamalaveri.pdfIn PDF document text
    • http://nadefememidep.medianewsonline.com/the_farewell_ending_explained.pdfIn PDF document text
    • http://sekujirimabasas.getenjoyment.net/how_to_set_up_sharp_xe_a207_cash_register.pdfIn PDF document text
    • http://naturelofo.mypressonline.com/sokutewetalinisegivoxeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485946/normal_600ff1b4f1227.pdfIn PDF document text
    • http://nunovoxiwanafuz.getenjoyment.net/does_ozone_make_good_bikes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500425/normal_60239abc0a872.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/do_you_need_to_use_the_water_filter_in_the_keurig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394077/normal_6029ac30f388f.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/tibanepoxilibud/360_degree_feedback_form_template._doc.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/zerodha_console_report.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/992041010.pdfIn PDF document text
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_685ac83ee96943179ace18787530b308.pdf?index=trueIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_42243895e18c4b3686a2a032d3eda52a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lukepepe/45040724838.pdfIn PDF document text
    • http://nibopinalilabaj.onlinewebshop.net/how_to_watch_tidying_up_with_marie_kondo.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_off0000d28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28A 5160 bytes
SHA-256: 4d4d635e6fad58b0cedc4657ec99dace99c7799ea52a6338e768eb99e5620386
font_01_sfnt_off0000e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 10220 bytes
SHA-256: 24da1cd5185fa55fdfaa42f4addf261fe785b115b6bcfdb78c053ef07f27b279

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