Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b8325cf7cf766e…

MALICIOUS

PDF

77.2 KB Created: 2021-03-29 22:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 79b83d552cff86e1d14a9ef38d2c19ae SHA-1: 9248677908f0fb4fff9673e7be434c32c0b041f7 SHA-256: 89b8325cf7cf766e80e7630f62cb8be3f2cea53fecbd72f9028a8f12069e9a75
186 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 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/award?keyword=shirt+cutting+and+stitching+pdf PDF link annotation
    • https://cdn.sqhk.co/nomavunut/gjAif22/dictionary_in_spanish.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/gopixav_xawifokafaj_muloxaf_bemusipomupite.pdfIn PDF document text
    • https://jufasoxoko.weebly.com/uploads/1/3/5/3/135315704/nitunipa.pdfIn PDF document text
    • https://vigobekopu.weebly.com/uploads/1/3/2/3/132302998/ecd3797b7d00c5.pdfIn PDF document text
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/bukedawenixij.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/dEibifV/dabegaf.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/2yjhiel/73336910020.pdfIn PDF document text
    • https://dofemavuxowag.weebly.com/uploads/1/3/0/7/130739836/rerofowitadapoge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496381/normal_606179ecc3e73.pdfIn PDF document text
    • https://kofukupapakube.weebly.com/uploads/1/3/4/5/134586312/neworexijip_mazenonuzefuxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382643/normal_605ca67ea6656.pdfIn PDF document text
    • https://cdn.sqhk.co/bujavenizake/pmhejjf/why_is_the_happier_music_video_so_sad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453888/normal_6036f960d40f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380411/normal_6031e7d56ac08.pdfIn PDF document text
    • https://relelije.weebly.com/uploads/1/3/1/4/131438324/07a560417a689c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://30fe55a9-f0c7-4aec-9bf5-b9d2225d99a8.filesusr.com/ugd/c4a51e_a6be3ea14824488c8a5fb17554fd9b56.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/free_template_slider_revolution.pdfIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_b9a44d45557a4c30b3c9f976d448f483.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/3d_car_cad_block_free.pdfIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_f766ba34ddcb4b058dfee068d400e73b.pdf?index=trueIn PDF document text
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_9ccc6b8c9cda4fc1b732770c3338ea43.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_off0000f079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF079 5488 bytes
SHA-256: deb6c7ee298bdc832cc1e84b57db0c8c4f1cdd3bce02df39325380acfc402363
font_01_sfnt_off0001031c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031C 10692 bytes
SHA-256: d37f00c3cd12cc1a0fde680ff3152bdfd675b23c2b0e7b6e290a0dab42858b32

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