Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b119ebc9947a573…

MALICIOUS

PDF

74.2 KB Created: 2021-03-19 09:14:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0a83827af13953c7a4d3e81d25caec8e SHA-1: 5ed06a20f902255a65a6a5eb14f203f4882ce4f8 SHA-256: 0b119ebc9947a5737fcabf035f2ad37c2fb0629fdbc01cb75639425398a47aee
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL being https://nipisod.ru/aws?utm_term=microsoft+project+gantt+chart+header. The document body, though heavily obfuscated, suggests a lure related to 'Microsoft project gantt chart header'. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. No scripts were extracted, but the overall structure points to a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://nipisod.ru/aws?utm_term=microsoft+project+gantt+chart+header PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385853/normal_604148553bc7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490523/normal_60337fa2aba8f.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/57253693784.pdfIn PDF document text
    • https://revowerixes.weebly.com/uploads/1/3/1/6/131607662/3b91f1da0.pdfIn PDF document text
    • http://nifazafagikoxa.medianewsonline.com/77584307081.pdfIn PDF document text
    • http://wulutano.mywebcommunity.org/pdf_file_sample_cover_letter.pdfIn PDF document text
    • https://nekonidi.weebly.com/uploads/1/3/0/9/130969497/7391770.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414352/normal_5ff5cf6a19a70.pdfIn PDF document text
    • http://jebebixazonutug.mypressonline.com/99226879589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499660/normal_603a682d7be3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448343/normal_6030142a1c99d.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/zopenave/bogupalajej.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/mefudemubinadavotuniriw.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/savabibulinawezepiwigafer.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/xuzaveg.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/neuralgia_facial_atipica.pdfIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_73029fc04d4448e6ad9ce9aabb9d077d.pdf?index=trueIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_ee58c74d70af481a92ae0d65433e765a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/carpentersville_illinois_police_reports.pdfIn PDF document text
    • https://c69a8150-bb1e-4c46-878b-fc1622391bd7.filesusr.com/ugd/cf91d6_ce0fa08f901348c1819b702562fecd36.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bokelur/tuval.pdfIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_28b5b8f429f04532b66a6d9fef604585.pdf?index=trueIn 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_off0000e514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE514 5468 bytes
SHA-256: b13f4d7b73910fd398e03e22f07b36b49a0766c1b3de0f80ad55fb5a0127ccd7
font_01_sfnt_off0000f7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B8 10432 bytes
SHA-256: e430bad9ff44378b63e5e1b7323e38940f2f390544f435cd52720c7f626414b6

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