Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f20f667b3470639…

MALICIOUS

PDF

80.2 KB Created: 2021-04-19 22:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7d6d40859484cdc16f3e53f45b263a7d SHA-1: 9fc85925d5f0d43a45fc925979e3c03a19514d0e SHA-256: 3f20f667b3470639b6e4f63ebafb7fbf7f676b5fe5cec43edbf38ffc86bbca54
156 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 5

  • 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.
  • 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://baarspo.ru/strik?utm_term=cloud+computing+services+for+small+businesses PDF link annotation
    • https://razisosip.weebly.com/uploads/1/3/0/7/130739291/liwuxudazobek_vuwezagopase.pdfIn PDF document text
    • https://pamukisap.weebly.com/uploads/1/3/4/7/134761215/wasej.pdfIn PDF document text
    • https://tebifuwufarul.weebly.com/uploads/1/3/4/8/134886387/0be5471e2f30005.pdfIn PDF document text
    • https://duxakezise.weebly.com/uploads/1/3/4/7/134713437/xukuzoliji.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/leteraxewe/apps_for_pc_video.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/15009113783.pdfIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_91bf26a0f2ef475cb8db6ef90727ddaa.pdf?index=trueIn PDF document text
    • https://77a5c3e7-429a-4f60-ad30-886abaef4f6e.filesusr.com/ugd/07a1ab_f9c87a2a79fa4e12be0c1098f575f856.pdf?index=trueIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_d12b19a29ce245b385344f71199e0f3d.pdf?index=trueIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_1e15e8f0b0cb48a1ac67eb5c68adb52f.pdf?index=trueIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_8f188c50ee984e27b7653f4e56ffba1d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezetega/67988978089.pdfIn PDF document text
    • https://21dbc830-6d60-48ad-8ab0-00d2b3cb69e0.filesusr.com/ugd/18d949_13dfe03e4fec473a984ba015b0a29eb0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/rejorifiviwamaxi.pdfIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_ad578fb949e94118950f4816054ed446.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/17183455863.pdfIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_27dcb9d676cd4de98fa178c95c179c96.pdf?index=trueIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_841af861ff6e4b48b4110aad6e737ec6.pdf?index=trueIn PDF document text
    • https://b0b89e74-75d6-43b0-bb8f-fa2cd9bd5f5b.filesusr.com/ugd/b5ae3e_7e70c4c335594166a753f5abe8cf4a0d.pdf?index=trueIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_af1369c2b8e04df286673b25d26d422e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jezobasit/wonamupofo.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/probation_declaration_form_kerala_govt.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://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_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 5580 bytes
SHA-256: 215d8fc95ae49613df62a93e32165d5042ad0af09b9d77a7446b06aed10ae4c2
font_01_sfnt_off00010f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6A 10584 bytes
SHA-256: 6a439015dd8840d58a73af6fa185fda7d7f7c0ba1aa1e7682597a9d18f3fd441

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