Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61deea6cc578c03…

MALICIOUS

PDF

95.3 KB Created: 2021-04-03 21:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 72c706cd280f59e5cb96bcb6bf0a8f95 SHA-1: c5d2b645dac853435cfef676f006ca2769e77cab SHA-256: e61deea6cc578c03be7f2cb620a13084c451f665c2c3be73c07e9e2341782246
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 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.
  • 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://xezojetit.ru/123?utm_term=post+matric+scholarship+guidelines+for+sc+students PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366339/normal_6027a988aac47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485689/normal_602987f6c4051.pdfIn PDF document text
    • https://diwujuxopawarow.weebly.com/uploads/1/3/0/8/130874606/lonuk-pafubamujij-zexukerevew-wogorijoxuvod.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/5012314.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497110/normal_5fcbc4022a7ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500430/normal_601d3af68b877.pdfIn PDF document text
    • https://rufeguduti.weebly.com/uploads/1/3/1/3/131384240/xawodifape.pdfIn PDF document text
    • https://fabapetabi.weebly.com/uploads/1/3/4/6/134687037/1c4483.pdfIn PDF document text
    • https://pedumodab.weebly.com/uploads/1/3/1/6/131637036/a1def27d.pdfIn PDF document text
    • https://relitemora.weebly.com/uploads/1/3/4/3/134352419/8886266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458623/normal_60420112f29a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xonadisusuvav.epizy.com/what_is_a_good_marriage_quotes.pdfIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_454af26ab3a34768acc30819f7575c64.pdf?index=trueIn PDF document text
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_504abb1a36d944aa946a2ff17c2d5731.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/best_rated_bed_sheets_on_amazon.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_a38ed11c381846f2be4c72e298adf2a3.pdf?index=trueIn PDF document text
    • http://ramozan.epizy.com/49783415864.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/gifakorexefava.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/2867547564.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/which_artemis_fowl_book_is_the_best.pdfIn PDF document text
    • http://wereguvepowu.epizy.com/kekalamaxebozilitanuzezip.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/verofonesorunavukut.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_off000137f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F1 5568 bytes
SHA-256: af4c2b9d107c1380c3db460b172ad891a2b1c8eff37b13588283991dbca57625
font_01_sfnt_off00014ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB4 10780 bytes
SHA-256: aad4eaf1c45d13a9b134a1d4a67ee0c7e589185c2a6cf7a9fa7b4257edde2c60

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