Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ff6d9ded3c0f72…

MALICIOUS

PDF

79.0 KB Created: 2021-03-20 21:55:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7211db768ebe9b7a3ac953087b1e5134 SHA-1: 87f7671bc3855d8eb018a5e7be780d3894575556 SHA-256: 91ff6d9ded3c0f723f18595fd380f577b645028bbaf36722b28c57b293a9f28e
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 0.9998

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://botokaw.ru/123?utm_term=epileptic+status+guidelines PDF link annotation
    • https://zozetaxurumel.weebly.com/uploads/1/3/4/5/134590082/gazenalosutep_fumak.pdfIn PDF document text
    • https://keboxatoxumire.weebly.com/uploads/1/3/4/5/134591907/titojovuvunurakol.pdfIn PDF document text
    • https://tarutugiwom.weebly.com/uploads/1/3/5/3/135326066/4ad260aec4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470035/normal_5fe79cae542e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494440/normal_600d5ce23ce83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417535/normal_601571501d9ca.pdfIn PDF document text
    • https://pujelewi.weebly.com/uploads/1/3/4/0/134017294/61cdc0a.pdfIn PDF document text
    • https://xogofodaromaf.weebly.com/uploads/1/3/4/3/134387758/3dc62d06e8d7a6.pdfIn PDF document text
    • https://tefojemitadu.weebly.com/uploads/1/3/1/6/131606809/7573185.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404287/normal_5fefe0357c80a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dc22526-dd23-4460-b3fc-234276df3dda/how_much_do_crown_replacement_cost.pdfIn PDF document text
    • http://tewamenuve.rf.gd/43367232899.pdfIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_0ba7bd85506d4e1baef0bef6589440c8.pdf?index=trueIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_0c6639af0cf74f1abaaee3c97a26efce.pdf?index=trueIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_4dcfca9678ea46d1939c3f52337b4b08.pdf?index=trueIn PDF document text
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_708c1bcb363849b296ca511c8095ad38.pdf?index=trueIn PDF document text
    • http://nepikonetoterit.epizy.com/alexander_technique_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5272959c-9499-43c9-a16b-1b88f2352430/power_yoga_sequence_for_weight_loss.pdfIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_fa63f857d4924ccb93b1ce962155c414.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_off0000f754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 5100 bytes
SHA-256: 2c88b444274c91f6d552a7cac03f5d485e328863e45c4ee5f8a4b3573432cfbd
font_01_sfnt_off000108c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C8 10976 bytes
SHA-256: 6fb4b240c2da06ba89b39973de6f5a8f1a148ddf8ba637e276bbaf680d8ac2a5

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