Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b807b8471411e69…

MALICIOUS

PDF

76.2 KB Created: 2021-03-11 20:27:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6beb00dc8a97e9961e2c0c9c0959c5b SHA-1: 31d8e793cbc04f37b516ebab8f6a2da668e0e324 SHA-256: 5b807b8471411e6992541a8606af4d1425b0fa4904e9b07fd4cab8e0c4bf2d3f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, indicating a potential link farm or redirection scheme. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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
  • 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://nipisod.ru/123?utm_term=clothing+line+business+plan+template+pdf
    • https://goponubinolofuv.weebly.com/uploads/1/3/4/6/134695307/5923707.pdf
    • https://cdn-cms.f-static.net/uploads/4375357/normal_603c7bfd7eafd.pdf
    • https://numeroluxovuz.weebly.com/uploads/1/3/4/7/134733954/2d2a14834b1b.pdf
    • https://cdn-cms.f-static.net/uploads/4403679/normal_60130b8100c85.pdf
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/wodarijegilazep_suxabete_kadosavafigez.pdf
    • https://static.s123-cdn-static.com/uploads/4493920/normal_5ffbe004ec583.pdf
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/553b44e51b.pdf
    • https://cdn-cms.f-static.net/uploads/4414339/normal_6015dcbe073a0.pdf
    • https://static.s123-cdn-static.com/uploads/4471091/normal_6005a5f1a48b8.pdf
    • https://cdn-cms.f-static.net/uploads/4422627/normal_604378248a205.pdf
    • https://cdn-cms.f-static.net/uploads/4384832/normal_600d1c67cb1e4.pdf
    • https://cdn-cms.f-static.net/uploads/4386822/normal_6036c54fa0cad.pdf
    • https://cdn-cms.f-static.net/uploads/4418199/normal_60110f32eb675.pdf
    • https://fisokupavunimi.weebly.com/uploads/1/3/4/4/134469682/332195214370181.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_e3fdad05c72b4bcba7d56beb770162ff.pdf?index=true
    • https://f5fa216c-c618-4dfb-b14b-efc64ff1fdf2.filesusr.com/ugd/0bcf16_ee3c597823694b159525006f1c97581d.pdf?index=true
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_630cfcea70db4184b437016652631136.pdf?index=true
    • https://s3.amazonaws.com/zuses/68117458332.pdf
    • https://s3.amazonaws.com/zafirawit/72358442423.pdf
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_0e3a2f45a7cd4dbe9c625f28b5bca2c4.pdf?index=true
    • https://s3.amazonaws.com/kumasala/receipt_template_fillable.pdf
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_ff8c578fda0e4f1aba2e88ffc62e75b0.pdf?index=true
    • https://s3.amazonaws.com/bisute/iata_lithium_battery_shipping_guidelines_2019.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc7.bin
f4cd0af54c9325ce832af36f6b200170d1da06b4eea5afc247a5e84f85380af4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 5404 bytes
font_01_sfnt_off0000fefa.bin
b0be7dfe70ee118804c0fed9a2dbf83f7d9c080879853664f0d39f484616a70e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFA 10564 bytes

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