Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcea992ba2616b03…

MALICIOUS

PDF

71.6 KB Created: 2021-05-24 18:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e7370dab5414594bf05e32c5a9b47fa5 SHA-1: 140b6e0145776fb27ba3ecdb25badcd471689eea SHA-256: bcea992ba2616b033c7b7e7f0cc9dd7be3630e96802bc47f3f940f152edff9c0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://nipisod.ru/strik?utm_term=baixar+livro+mentes+perigosas+pdf+gratis PDF link annotation
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/4eb8808a.pdfIn PDF document text
    • https://juwufugoxeza.weebly.com/uploads/1/3/4/5/134528381/2394903.pdfIn PDF document text
    • https://bewotababuruga.weebly.com/uploads/1/3/1/1/131163836/855ad.pdfIn PDF document text
    • https://defejeve.weebly.com/uploads/1/3/4/3/134386135/maxomitijat.pdfIn PDF document text
    • https://kutenamig.weebly.com/uploads/1/3/0/7/130740069/1153488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421943/normal_5fd09f07dde73.pdfIn PDF document text
    • https://neseriduro.weebly.com/uploads/1/3/4/8/134851425/f33d45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384316/normal_5fcf09eb19725.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/gogonof/27516743648.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/82307053784.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/chairman_job_description.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/ben_10_games_3d_free_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/30mm_cardioform_device.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/pinotigob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5604116b-5804-44cb-991c-b17f146add4c/the_power_of_love_celine_dion_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/vesupajasewiro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b7565ed-6aba-4054-8585-6acccdd61619/26161139706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0c99ad9-b0d1-4eac-a1c6-27ca11a3aee5/does_costco_have_keurigs.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/62848351419.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_off0000d33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33F 5536 bytes
SHA-256: c8f44bfdeaa0a3453f1f2ef13ba25690c843133884b195c80913920b09fda1a9
font_01_sfnt_off0000e611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE611 13400 bytes
SHA-256: f2d5e75177ba894001a0f4293b2791b79142d68a71a1b8efdf3fc1b1784085ed

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