Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb0f2a98e66bd759…

MALICIOUS

PDF

103.7 KB Created: 2021-03-21 00:51:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 81898a40513d4fcb6784dde31d9891ea SHA-1: 96640f681f89e014054da93dde58e8d256944840 SHA-256: bb0f2a98e66bd7597895be3591489b4c2b8ed72b2dd5e94b90ff5df5aca9b113
194 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical PDF link farm detection and an ML classifier. It contains numerous external links, with one pointing to a suspicious domain (mezovuduw.ru) that is likely used for phishing or malware distribution. The document's structure and embedded links suggest it is part of a campaign to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://mezovuduw.ru/123?utm_term=knights+chronicle+starting+guide PDF link annotation
    • https://waperaterorug.weebly.com/uploads/1/3/0/9/130969933/1518291.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/jffigjf/bloons_td_6_apk_20._0_no_mod.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/1de404fc5ab8fb.pdfIn PDF document text
    • https://cdn.sqhk.co/gadakoferupa/gj6hgYv/viwuli.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/rhghbha/zobor.pdfIn PDF document text
    • http://zutalinezar.iblogger.org/horus_heresy_horus_rising_audiobook.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/af68b49b-aba4-4af1-8ad3-6089622cdf50/what_is_the_top_1_percent_income_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55006ff1-61a7-4e7a-839b-84956382f135/9038794740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d025616-302a-466c-89d0-4ed7648e11f5/shatter_me_featuring_lzzy_hale_-_lindsey_stirling_mp3.pdfIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_b8e7164c2078422cb65e973d7507cb0d.pdf?index=trueIn PDF document text
    • http://rebokomixuxoj.epizy.com/what_does_the_ages_mean_in_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2b87323-f9c2-4262-b7b2-b3872888522d/sony_fs5m2_price_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/592306ab-1299-44e6-98dc-ff5544031719/52496004126.pdfIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_be94b2322cae4854b7b66bebcfd3415c.pdf?index=trueIn PDF document text
    • http://zowujobosega.rf.gd/coombe_dean_school_ofsted_report_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32a4ab34-ecd2-4e5f-9e7c-fb219a7a8aec/how_to_stop_freezer_over_freezing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/815729ca-5f6a-4929-b170-57a6ab162487/ropapejapotowijobiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15ccd6c0-7ecb-443a-9fc6-ab3603e6577a/namepem.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000135e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E1 5052 bytes
SHA-256: f2261668ce75d53f41afef941cf434214606f290d5dffa9abf2f7875210acdcb
font_01_sfnt_off00014700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14700 11000 bytes
SHA-256: f4db206791d32757873a311d84232a4f46480754c6569e1a5038f51bd57cc787
font_02_sfnt_off00016ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CA6 16376 bytes
SHA-256: 4954ddec54c61b6acc7eddbac306bc890d05f3afdfcf3ae890c7612da0a7d668
font_03_sfnt_off0001824d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1824D 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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