Malicious PDF — malware analysis report

Static analysis result for SHA-256 516b9ab0d7cdea68…

MALICIOUS

PDF

75.9 KB Created: 2021-03-20 01:31:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7ac01675f161b4f289e76d758b9a1029 SHA-1: 0a63f19e61e570231363e5eccae1acbe6821cbe2 SHA-256: 516b9ab0d7cdea680287a51aab5ee81ba16bccdc4bcd0645f3300c75dd661efd
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple external URIs, with a primary one pointing to 'lozipotod.ru', suggesting a phishing or malware distribution lure. The document body, though heavily obfuscated, appears to be related to a worksheet, which is a common lure for social engineering attacks.

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://lozipotod.ru/wix?keyword=proving+two+lines+are+parallel+worksheet PDF link annotation
    • http://mizebojusur.mypressonline.com/canon_pixma_mx922_printer_for_sale.pdfIn PDF document text
    • http://latitekiwa.scienceontheweb.net/wipeziluwedanebupesuxotut.pdfIn PDF document text
    • http://lenulari.mypressonline.com/did_you_hear_about_pre_algebra_with_pizzazz_page_241_answers.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/nimuwet/sobulopuxo.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/fixture_difficulty_cheat_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/406172cb-ccd2-412e-88a4-06854e4d2ed7/40138039460.pdfIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_afa58ac63b0d4fd3bf11697f70f1f87a.pdf?index=trueIn PDF document text
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_988cc6d392a440959faf70c3f8fb86a1.pdf?index=trueIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_81342993861c4bfd8ff3b5c40f466442.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc111481-193e-410b-b47e-033229685078/sideleguxav.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/most_accidents_are_caused_by_human_error.pdfIn PDF document text
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_2aec557093e443f981481b7ea39368f8.pdf?index=trueIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_a83a8c569e7d43cc8b798dbb866e0de5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/jedevutevanumizupatat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/752020e0-60e1-443c-aa3c-295815e05697/how_to_add_multiple_answers_in_google_forms.pdfIn PDF document text
    • http://madigekole.onlinewebshop.net/how_to_use_jawbone_up_in_2020.pdfIn PDF document text
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_f5484e2497c947fe98bf770e36a5d97c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/17be4937-1f75-4164-9fff-c1fe593de917/whats_another_word_for_young_age.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_off0000e9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D4 5300 bytes
SHA-256: 1eb0def4b5fd22ffc0d017676e89fd02459592079f8c2eb41ea3ffe5399e73b9
font_01_sfnt_off0000fbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEE 11468 bytes
SHA-256: 8b0bc5f39e7d970e27f03fde832314c5426510d3569a5d4ea908d45a7649a9b0

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