Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d3587d4deba9b4…

MALICIOUS

PDF

70.4 KB Created: 2021-03-12 10:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8117cfda2621a4cd24d91c56e8a30768 SHA-1: 78f67e24eb010e5eafca4861c3ef86348cb7ce1b SHA-256: a5d3587d4deba9b478587ec792b1fc3c1d3c7414b8b559425cfca22c7b322db2
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm and is flagged by a ML classifier as malicious. It also contains an embedded URL pointing to zajinet.ru, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'Eddie Bauer pack and play instructions'. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=eddie+bauer+pack+and+play+instructions
    • https://cdn-cms.f-static.net/uploads/4474739/normal_5fd3ce35d92a8.pdf
    • https://cdn-cms.f-static.net/uploads/4376086/normal_5fd2002dd2e1d.pdf
    • http://sesesuruko.mypressonline.com/revolution_prep_sat_reviews.pdf
    • http://paselon.getenjoyment.net/puwabufugilopuzederarawiv.pdf
    • https://cdn.sqhk.co/furafurume/v6iajie/jorajog.pdf
    • https://cdn-cms.f-static.net/uploads/4413567/normal_603ec704163e7.pdf
    • https://cdn.sqhk.co/tumufiwusifo/CheKhjc/grant_wood_aea_online_learning.pdf
    • https://cdn.sqhk.co/xidujefonari/iehKhf2/how_to_do_denim_iron_on_patches.pdf
    • https://cdn.sqhk.co/rudixika/hajdgig/pudodugapaxixawijejifasub.pdf
    • https://cdn.sqhk.co/bupewazadufa/jhshblz/73545503318.pdf
    • https://cdn.sqhk.co/jotenitix/jhihvlL/27575560099.pdf
    • https://cdn.sqhk.co/repoxovu/1iKIZgi/79352262192.pdf
    • https://cdn.sqhk.co/gebitasixa/6cgjge0/kazawaxanufaz.pdf
    • https://cdn.sqhk.co/purorelaz/cDhigji/walkthrough_for_toca_life_world_town_center.pdf
    • https://cdn.sqhk.co/gafazakedoki/hAhe6je/xidobubatafupavopelexovaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lobopekogolo.onlinewebshop.net/39563672585.pdf
    • https://s3.amazonaws.com/zebarufuridorur/viwija.pdf
    • https://s3.amazonaws.com/tesasubawalozan/gosovojusut.pdf
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_800a19868b3945b48a4e5ff2b4fb59ab.pdf?index=true
    • https://s3.amazonaws.com/fosagoba/xupovokomej.pdf
    • https://s3.amazonaws.com/xeruxaxer/who_guidelines_for_diabetes_2016.pdf
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_92c99d36b8ad4d928a8974d3470e9139.pdf?index=true
    • http://gosaduzunake.myartsonline.com/how_to_change_honda_pilot_transmission_fluid.pdf
    • https://s3.amazonaws.com/zaxuledo/apple_annual_financial_report_2014.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d62f.bin
2afee8e6af28191fc24f3ee75fe9f5fc949ba49a691fd62d1026c43a85a68bba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD62F 5332 bytes
font_01_sfnt_off0000e864.bin
aa843628093239ac72a2c3ebdc01460453ea99e172db08c6d2455ddccfe04717		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 10740 bytes

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