Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a3b4dfb9d5317e…

MALICIOUS

PDF

63.2 KB Created: 2021-05-30 12:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0c9efe718ae29ce4485331b38af983ae SHA-1: b3ae3d3744a55452755bb3755f0da6debe4b3bd8 SHA-256: 83a3b4dfb9d5317e395d3f89a333d661937244c8a5aa062b18402e9f43cd3c38
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-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.
  • 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://ponafet.ru/123?utm_term=bing+live+wallpaper+android PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445869/normal_5fcb99dc5d81a.pdfIn PDF document text
    • https://zufulakoloti.weebly.com/uploads/1/3/5/3/135301661/kixujikexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377717/normal_60155d02de063.pdfIn PDF document text
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/bc6ce3686a91194.pdfIn PDF document text
    • https://sifufunozomelu.weebly.com/uploads/1/3/4/7/134764248/tifobusijes_rorakeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380214/normal_5ff0f7e087301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495390/normal_603e893c170d7.pdfIn PDF document text
    • https://xirajepubodub.weebly.com/uploads/1/3/4/5/134592092/sopoguladob_wugijokuzi_vovevukuxili.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377401/normal_6005b1457072b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427267/normal_60218efe4222c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446155/normal_601fa8f180b19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409092/normal_6054218ed5c84.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/66eb6e24-6d2a-4bfe-bd90-0471b2405949/re_zero_light_novel_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ae4623-7def-4a30-b784-0f7f643982f6/78768109259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d49ef8f7-e206-48ec-a343-7e7e6b4fd668/how_do_i_setup_my_smart_band_health_steward.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_off0000bcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD7 5152 bytes
SHA-256: 6fb9acf61779b1cdfe9032de4682fc12008a35a47c0d007de59de73b5feddeb6
font_01_sfnt_off0000ce81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE81 9812 bytes
SHA-256: 992a2aa9c4bebe3366f7b7e446997951b034ade51f140c6f308e959289083e8a

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