Malicious PDF — malware analysis report

Static analysis result for SHA-256 b987414e86bcd3b4…

MALICIOUS

PDF

75.8 KB Created: 2021-03-15 22:12:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 647a8039d3fa88f973020c2478081b49 SHA-1: 412c48a4a0d843704f84b5f9bd89929e9e18a9a7 SHA-256: b987414e86bcd3b44c0ea0b3404cf0e76ab3d7fc1519d8aa8c65104bb7d8ee82
104 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URL pointing to 'zajinet.ru', which is likely a malicious domain used for phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to urgency, supporting the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wix?keyword=red+dead+redemption+us+marshal+outfit+not+unlocking
    • https://cdn.sqhk.co/jisaside/cjiTWii/goruveb.pdf
    • https://static.s123-cdn-static.com/uploads/4480387/normal_5fcf82ad4a9fc.pdf
    • https://cdn-cms.f-static.net/uploads/4427514/normal_600a015bc7565.pdf
    • https://cdn.sqhk.co/xuluriwu/idiihe1/slot_machine_casino_near_me.pdf
    • https://cdn-cms.f-static.net/uploads/4487631/normal_603ee70969353.pdf
    • https://static.s123-cdn-static.com/uploads/4377933/normal_5ff6809cf17b3.pdf
    • https://cdn.sqhk.co/nulusezitelo/Mbhiaql/mulova.pdf
    • https://cdn-cms.f-static.net/uploads/4366035/normal_6014c14882f68.pdf
    • https://cdn-cms.f-static.net/uploads/4369499/normal_60117007d7fc8.pdf
    • https://static.s123-cdn-static.com/uploads/4452169/normal_60003103c289d.pdf
    • https://cdn-cms.f-static.net/uploads/4390068/normal_5fd93b47a61e8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/loranoduzuja/cdata_xml_formatter.pdf
    • https://s3.amazonaws.com/paropabaru/79970363.pdf
    • https://s3.amazonaws.com/wobuzisibal/90825050044.pdf
    • https://uploads.strikinglycdn.com/files/ef5c10d1-e760-4fb1-a2a1-ddca2dd1ad8d/hotel_new_yorker_new_york_tesla.pdf
    • https://s3.amazonaws.com/dabatisew/tata_sky_app.pdf
    • https://s3.amazonaws.com/dusubonifu/b._ed_online_form_2018_ignou.pdf
    • https://uploads.strikinglycdn.com/files/4dc76a42-d27b-4b95-ba42-171b92bf0a43/sulojabel.pdf
    • https://uploads.strikinglycdn.com/files/0e141fbd-28ab-40b5-97ce-deb0774e02b7/what_are_the_character_names_in_lord_of_the_rings.pdf
    • https://s3.amazonaws.com/pazerogasarinu/19867137140.pdf
    • https://s3.amazonaws.com/fuwenoxuzasila/skyrim_how_to_100_smithing.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_off0000e797.bin
387b1512aa2d9e174059a50c2af0f6e78b881c39f32590744ced480033b9b450		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE797 5640 bytes
font_01_sfnt_off0000faa7.bin
5bb9c39c9cdc80f5c334a1b6a0f7691ca4de049b536fd36f2bb03c8a7398cf94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA7 11536 bytes

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