Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef04b268dfdfb1c6…

MALICIOUS

PDF

116.3 KB Created: 2021-05-26 07:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7d2020d83ee95e2a643139ba8ca9b421 SHA-1: 082598ff0e81b930757577f2a43a5cc3069f5457 SHA-256: ef04b268dfdfb1c6e5146e976cb8b1a53dab78d271fa2dccd45e442643bf587d
156 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 potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://mezovuduw.ru/strik?utm_term=does+anti+snoring+mouthpiece+work PDF link annotation
    • https://poriveba.weebly.com/uploads/1/3/4/3/134316211/xesaposuvi_lazosafizix.pdfIn PDF document text
    • https://zutosexumapa.weebly.com/uploads/1/3/1/6/131606298/wewoduka-nevov-kemotipoxeguwu-xavowozakavi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405443/normal_6034155e74db2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496193/normal_604064c89ec49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491673/normal_5fdbcb45a0b7f.pdfIn PDF document text
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/130452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498645/normal_60581616ea592.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444623/normal_60247c9db780b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420756/normal_6041ab15a41f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483587/normal_60371f3e2b2fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455183/normal_604d1ef400af3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_6020babf61b7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454803/normal_604d37ad08906.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/tamovagag/learn_aramaic_language.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/4505608724.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/51513392477.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/20317160701.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/11533799163.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/best_stock_for_2021_usa.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/nijenibagimezazawogafun.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/bifiv.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B94 5472 bytes
SHA-256: b8a623457e1737d8c83016eddcf1adcc8f52cb208db5b85cb8ef2cec2f4efe4e
font_01_sfnt_off00017e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E19 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off000186a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186A7 11376 bytes
SHA-256: 029f73ec0dc89b0d3fd4ef1009a385717f94032a76f5190f0c3c20b9dbe8dda8
font_03_sfnt_off0001ada4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADA4 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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