Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c33efb116840ef…

MALICIOUS

PDF

71.3 KB Created: 2020-12-13 22:34:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 7acdf34a287b67394eff84181f9ce1f6 SHA-1: d5abb25b7338e65eb1c70979ba8a260194116a6a SHA-256: c4c33efb116840efe9c3454fba28aa653b92156b795ac3c2ee70a688cd4ccfb8
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 0.9997

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://trafftec.ru/strik?utm_term=benchmade+infidel+3300bk-2001 PDF link annotation
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/mabuvujo.pdfIn PDF document text
    • https://pajopujo.weebly.com/uploads/1/3/4/3/134305169/7383388.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369797/normal_5f8d9aa24fad9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393018/normal_5f91f87080b37.pdfIn PDF document text
    • https://mefixakiderix.weebly.com/uploads/1/3/4/3/134319494/fivijavo-losuxezogosojus-gonirawuzoj-purorogaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403673/normal_5f912cdcb3220.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5156917e7202640050e05/t/5fca24634e3f3d25174424de/1607083107922/4885828651.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc312238ef7301f8b1ef899/t/5fc6eb5393ad1a48120cd244/1606871892569/votuvo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7a69f81da8a590db1d885/t/5fd161dd8185f4776aff7b07/1607557598662/54171280647.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5419e5e8e827d42aa8690/t/5fc91a2ea49e01393cec58ca/1607014960464/47913681286.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc12ec9f7cf8c75402cc175/t/5fd1eaf4eeaf2774ac902808/1607592694678/35918975331.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/rikikudusej.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B8 5764 bytes
SHA-256: d7ec7560ae2f489f9a2bcd5e23139605100eabef081a7c9f0aa1791d79152928
font_01_sfnt_off0000d63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63C 11128 bytes
SHA-256: d9f14dc4b3ddbd86b548f3d49c1ec66ba17e4bad095f705260cad43126e6e211
font_02_sfnt_off0000fc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC19 16036 bytes
SHA-256: 149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1

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