Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4cef8066c0a1f9…

MALICIOUS

PDF

64.3 KB Created: 2021-03-22 09:48:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 30f381a39ccc3405560eedb7113d23e5 SHA-1: 8fb83810fb407978966367c19e4d70824a7f0d49 SHA-256: 5e4cef8066c0a1f90ff88f2bf6c3eef2ab0fd54a676de237ddecf3b6a4952c2c
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 0.9998

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://crophysi.ru/wix?keyword=graphing+radical+functions+worksheet PDF link annotation
    • http://korecos.ru/buferenanakukeramamofomonyw9m8.pdfIn PDF document text
    • http://maslovauto.ru/who_moved_my_cheese_number_of_pages3zge7.pdfIn PDF document text
    • http://thecet.xyz/17625911957yt1qb.pdfIn PDF document text
    • http://thehensleys.org/ielts_plus_3_listening_test_5_answerskqgll.pdfIn PDF document text
    • http://amandeepsadyora.com/karevukjg9.pdfIn PDF document text
    • http://ionatr.fun/funny_books_for_five_year_oldsoort6.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/pajeriramal/forks_over_knives_movie_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ba84419-b4a4-485a-bd53-1466708733b3/90841003541.pdfIn PDF document text
    • http://rexawisoza.epizy.com/90864682014.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/44836757993.pdfIn PDF document text
    • https://176fe727-baa2-4f6f-8ab0-cddcd97ecb74.filesusr.com/ugd/45df28_39d1d859495e46d89975c1d5a02e3205.pdf?index=trueIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_9d6b66731c3d4f429ea83cdede49cc13.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/49f9902f-3295-4ca2-836b-90065f1e4e12/zeralotelifix.pdfIn PDF document text
    • http://mijikudetixo.epizy.com/al-_anon_literature_order_form.pdfIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_58264c889d1247d587622f3f8898d9ec.pdf?index=trueIn 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_off0000bf0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0B 5604 bytes
SHA-256: e27e4068ae356c38462dbb7bf13e6c6758d6ffbfcabdfbacf357f1e99b1897c8
font_01_sfnt_off0000d22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22E 9936 bytes
SHA-256: a6908cd859918f1703ddc605d7da949fc16d5d52c044ad965e0bd9d8d692c3b6

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