Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de1831572699e21…

MALICIOUS

PDF

75.3 KB Created: 2021-05-28 21:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17ea9aed2f18501f51fd7892d7a0ae2e SHA-1: 5aaa6673b41b19919f67ffff1216ef951f603ef6 SHA-256: 4de1831572699e21361269b2ec034db24431a7473338137b1ff322a89ece9543
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, indicative of a link farm designed to manipulate search engine results or distribute malicious content. The presence of a download button lure further supports a malicious intent, likely to trick users into downloading further malware. The ClamAV detection and ML classifier strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/strik?utm_term=yeh+desh+hai+veer+jawano+ka+remix+mp3+song
    • https://static.s123-cdn-static.com/uploads/4457590/normal_5ffe7e20241ae.pdf
    • https://cdn-cms.f-static.net/uploads/4471948/normal_603df1babf354.pdf
    • https://rokolumer.weebly.com/uploads/1/3/0/9/130969153/punaxepe.pdf
    • https://cdn-cms.f-static.net/uploads/4370285/normal_60193865dc70d.pdf
    • https://static.s123-cdn-static.com/uploads/4450257/normal_5fe161bea762b.pdf
    • https://ragibifurox.weebly.com/uploads/1/3/1/3/131379945/fisidem.pdf
    • https://cdn-cms.f-static.net/uploads/4424666/normal_60387dd16b7ae.pdf
    • https://zodijezuworid.weebly.com/uploads/1/3/1/4/131483265/ruwakudasa.pdf
    • https://pupifino.weebly.com/uploads/1/3/0/7/130776741/fapofazoguw_ledulilanebabur_nufetimutunupo.pdf
    • https://mawebexakonu.weebly.com/uploads/1/3/4/3/134390129/tizurupunudatoz.pdf
    • https://biwugina.weebly.com/uploads/1/3/1/1/131163984/xemit-ranamotosoved.pdf
    • https://dawosovakix.weebly.com/uploads/1/3/6/0/136097295/fobolora.pdf
    • https://gesebasalevajil.weebly.com/uploads/1/3/4/8/134879020/najamelalibef.pdf
    • https://static.s123-cdn-static.com/uploads/4494136/normal_5ff905bd7db4f.pdf
    • https://busonuvawariba.weebly.com/uploads/1/3/4/3/134355681/a69ca6fe7.pdf
    • https://sixusiwof.weebly.com/uploads/1/3/1/4/131454093/f87750cbfd8c.pdf
    • https://cdn-cms.f-static.net/uploads/4408601/normal_6041e2cf55ef0.pdf
    • https://cdn-cms.f-static.net/uploads/4495531/normal_604d5d9ae30be.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/1cd2ec6b-0c7b-4735-b139-b995a3ae7feb/gowimosirigodegonokore.pdf
    • https://uploads.strikinglycdn.com/files/8fb3605b-4a23-4841-b502-4ec4b8dc051f/loxopuwusugisa.pdf
    • https://uploads.strikinglycdn.com/files/d08942a0-9e9b-4788-a186-d4caead328de/radatopapefuz.pdf
    • https://uploads.strikinglycdn.com/files/fbedaba2-459f-44e5-95d7-030eec8b2f51/schema_electrique_clim_peugeot_expert.pdf
    • https://uploads.strikinglycdn.com/files/90cf8ee5-fc2d-4c9b-83d9-3ada8d2a53af/12340807264.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbef.bin
01ea1f8cf2bb469fa79dd66e167be1ccf597d7766b2315ed24b145f52e4741f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEF 5532 bytes
font_01_sfnt_off0000eea8.bin
0dd787111b3f7cf0e6b9425a029355463115edd308ebdbe072baccfe184c4f20
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 10148 bytes
font_02_sfnt_off00011195.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11195 4324 bytes