Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80c27a5fb832d34…

MALICIOUS

PDF

76.3 KB Created: 2021-03-01 15:14:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 081b1e6a3b13e8c09628051611e6474f SHA-1: c6eb09bd3d8e20eaf7b394c57a57d556ecdf9877 SHA-256: a80c27a5fb832d34825d95fee3c7524c9e7930b5983e11f73e912fedef310680
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs indicate potential for malicious redirection or content delivery, possibly leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/award?keyword=to+all+the+boys+i%2527ve+loved+before+3+trailer PDF link annotation
    • https://wojebera.weebly.com/uploads/1/3/0/7/130775791/rofekotowebasi.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/what_order_to_read_wheel_of_time.pdfIn PDF document text
    • http://madoxorijegobe.sportsontheweb.net/jonathan_livingston_seagull_book_online_free.pdfIn PDF document text
    • http://vofufime.mypressonline.com/25917030113.pdfIn PDF document text
    • http://fiwisud.getenjoyment.net/kidde_smoke_alarm_-_long_life_sealed_battery.pdfIn PDF document text
    • https://pufotesur.weebly.com/uploads/1/3/1/3/131378771/926141.pdfIn PDF document text
    • https://deriwofapavuz.weebly.com/uploads/1/3/4/3/134311795/183e607edb85459.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/17022840783.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409114/normal_5fdddffce3cbc.pdfIn PDF document text
    • https://venevivoxeda.weebly.com/uploads/1/3/1/8/131857756/jubugeve-mibugapix-wupemojageluzu-pazawomelig.pdfIn PDF document text
    • https://jexiliwole.weebly.com/uploads/1/3/0/7/130739190/vibezajedegimope.pdfIn PDF document text
    • https://gefetejumifigo.weebly.com/uploads/1/3/4/6/134688955/32c8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499299/normal_5fe50aa985ef0.pdfIn PDF document text
    • https://lidisujuv.weebly.com/uploads/1/3/4/5/134515282/rekil.pdfIn PDF document text
    • https://zijolafazul.weebly.com/uploads/1/3/0/8/130873795/7105101.pdfIn PDF document text
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/jikatakaxevoduje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sogivuwe.onlinewebshop.net/85101332155.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 5444 bytes
SHA-256: 21b0f03571e7dafac541336de6018226b00264da6aa2b6d98d38640b74ddc86a
font_01_sfnt_off00010601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 10184 bytes
SHA-256: b33dde7985cb6b0fc1d24e8723d908efb7cd5c85dffaae3d8ce48a3de9390b29

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