Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e78c8f9b30e5b4…

MALICIOUS

PDF

91.4 KB Created: 2021-03-17 03:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6c70e7943519bbd93c1f93c10b6aebdc SHA-1: 2e49d667200743b4c7203daf3b41de6a14672fb2 SHA-256: 91e78c8f9b30e5b4ec8cc52e6686f7ed6a13d77b410d08587a23a26d3c2c36df
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://ponafet.ru/123?utm_term=cainhurst+castle+guide PDF link annotation
    • https://jakilirimilibev.weebly.com/uploads/1/3/4/8/134862861/3212614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486051/normal_60188b333ee2f.pdfIn PDF document text
    • https://pabovojusu.weebly.com/uploads/1/3/4/3/134339388/3653271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379489/normal_60150b77a1b98.pdfIn PDF document text
    • https://wodanosivowifig.weebly.com/uploads/1/3/4/5/134593279/pikotif-juralas-durebakapa-wofimate.pdfIn PDF document text
    • https://wilubiluzitewi.weebly.com/uploads/1/3/1/4/131413550/gejumimuwuful_setuwerovisugom_jefedo.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/dovulavavo/baldwin_filters_cross_reference_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6e4c584-a21c-46a5-933f-5a1baa1d05c2/shivprasad_koirala_7th_edition_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/roluxabevu.pdfIn PDF document text
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_29f1196602b0473ea3e384e9c3d712f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cff2443-b9c4-445f-a49e-73f9d93abaae/kozunufenaraxapugew.pdfIn PDF document text
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_e168031c124c4935aafc7052017669aa.pdf?index=trueIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_f21b1a6b0ec544c7aba2bbea93877d0e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee12e1b8-bd96-4a7b-9127-e3be626c42e3/lowiraroxipak.pdfIn PDF document text
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_2e78d74c70ca4fb09a6a99d8ab54abee.pdf?index=trueIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_77bd9da251a7481c9838357345f99c1f.pdf?index=trueIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_918f6fe4bea04881a161fc7e26f6be28.pdf?index=trueIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_4e5e2f15a2494f429de37c1f4a0354e1.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_off00012a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A29 5104 bytes
SHA-256: 3dd01d07d7574507b6221346124837716ff803ab71ec01fdbdd989451a3b99b6
font_01_sfnt_off00013b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B75 10480 bytes
SHA-256: 725fc9a0af23e98d6ede3b3cf0b34f79f61b6a07c455b4927b48f7557ef2a4b5

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