Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d66afe191f5b64…

MALICIOUS

PDF

81.1 KB Created: 2021-04-03 08:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c0237841986df655d614a6f14b83ff7b SHA-1: 1386f9b4e8d277e05e46d0b9f2d079cd66d303e2 SHA-256: 22d66afe191f5b6411237515137afc0890b0aa6a2e58ab39c970b30342a11fcf
186 Risk Score

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 0.9997

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/strik?utm_term=dell+docking+station+wd15+won%2527t+turn+on PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4428052/normal_604ceb84e2069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489255/normal_604d2afa59692.pdfIn PDF document text
    • http://kujamemapevubu.mypressonline.com/teologia_sistemtica_alister_mcgrath.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_6010f7e824d09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501509/normal_60463fcde97fa.pdfIn PDF document text
    • http://jebonefawudo.sportsontheweb.net/47162931388.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_a0d141155819490989953ff3fd175e50.pdf?index=trueIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_f462cd2d6df74627b541fc4d2abba309.pdf?index=trueIn PDF document text
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_050382ad1d014a339d9be0e965b6f7b7.pdf?index=trueIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_28c18a6cb17648018857ec2a704db7da.pdf?index=trueIn PDF document text
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_4a3ee62d387340d4934b59eebd4e442e.pdf?index=trueIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_9325887446a041938ad05d96758aa148.pdf?index=trueIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_03222c13d7504fc6b7bc0f8b0e1b6b29.pdf?index=trueIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_cb5e52b9874c45b99862532fe5f74cf6.pdf?index=trueIn PDF document text
    • http://nujajixunagiweb.epizy.com/95252362238.pdfIn PDF document text
    • http://rajixubododafu.epizy.com/beginner_piano_sheet_music_with_letters_free.pdfIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_0b5d3a3a97d74f1dbdaa6436330519c8.pdf?index=trueIn PDF document text
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_0b45188e831248f5aa0344d20f74bec2.pdf?index=trueIn PDF document text
    • http://bozalusi.epizy.com/press_the_button_meme_template.pdfIn PDF document text
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_b6342cfad42e42eabf052279ded4f3f7.pdf?index=trueIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_209bba3b90414d4fac9f8ff26af4b404.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_off0000ff9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9D 5472 bytes
SHA-256: c3911cdf8b698154cb91490ccc3bd62e429648a2b959586f4b2999f1621f4ab6
font_01_sfnt_off00011275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11275 10908 bytes
SHA-256: e3de46f5d3c9eb8a0adbedc84d77cfb41ed70360a3787f2c3c30c7bf79fd16a6