Malicious PDF — malware analysis report

Static analysis result for SHA-256 76241b37db994759…

MALICIOUS

PDF

71.8 KB Created: 2021-06-07 03:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 43002fd4a1d3310fee624217d21eeca2 SHA-1: df62850251f2db25d7e480e77cfaa4d8d0a937e9 SHA-256: 76241b37db994759f453af4737c23718908f6b733a013c04c7bf417830abdf17
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://smidgel.ru/pbw?utm_term=cswip+3.1+course+material+pdf+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451217/normal_601f58ece45f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486034/normal_6063411fdf010.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486535/normal_5fca710b4665a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459035/normal_6031e77f31dbf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382406/normal_6002166a44e86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452161/normal_60b9a44d47104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380079/normal_6029a9ae2f952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386087/normal_60b95acc8b867.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413713/normal_5ff31c4defcd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372985/normal_60133f3ce53e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385207/normal_603be18dbfe06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416940/normal_6014320dadc93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378599/normal_605ffeb07ccbe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://moxulolo.pbworks.com/w/file/fetch/144753090/filmora_9_all_effects_pack_free_download_mac.pdfIn PDF document text
    • http://sajateves.pbworks.com/f/98119426914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89bcb665-89eb-4f96-8d8b-5d9938789cb7/4841759046.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/f/10323792770.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b9531fd-b689-4bc4-8ee6-c3168dd1ffb0/wimoxibapusobalalek.pdfIn PDF document text
    • http://damopijos.pbworks.com/f/how_to_send_money_from_my_simple_bank_to_cash_app.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/w/file/fetch/144495798/days_of_the_week_esl_kindergarten.pdfIn PDF document text
    • http://midevodimu.pbworks.com/f/how_to_say_please_find_attached_in_german.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cb68f59-72b8-4710-8fc8-6cc708832833/kutinakegumijag.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_off0000d658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD658 6012 bytes
SHA-256: 3634d644351b3a4a7738781e7e04fb5f930dc7d8517b3dd3cb07c45d8dd54ba4
font_01_sfnt_off0000eacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACD 10884 bytes
SHA-256: c5fd5a5aeaf61a325ac7e750cf32b7abf35a1df21c4b16b4c4f38e760a36b86c

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