Malicious PDF — malware analysis report

Static analysis result for SHA-256 d055043ae893d070…

MALICIOUS

PDF

84.6 KB Created: 2021-02-11 22:06:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b4b61076ca02c9401758273deee57ea0 SHA-1: e6c49ca8e7a1fa9b338a0c73ee61c582397695e6 SHA-256: d055043ae893d070c7264f12f98f81e89c75c52788f8de5d14f34db770cd63e7
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://crophysi.ru/wix?keyword=wok+and+aok+in+tok PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380695/normal_601d0f4420e5d.pdfIn PDF document text
    • https://wanusasa.weebly.com/uploads/1/3/1/0/131070791/809f119ef2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382613/normal_5ff16b6c3cbba.pdfIn PDF document text
    • https://tijirurilulade.weebly.com/uploads/1/3/4/3/134312421/rubaron.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504568/normal_6008bcfa4e4c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409827/normal_601fded7672e1.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/bjfAZ5G/benijokamij.pdfIn PDF document text
    • https://cdn.sqhk.co/tatogevi/ijmghgg/bunuzilakizodogatorafu.pdfIn PDF document text
    • https://cdn.sqhk.co/wemonamo/hXhdtje/flappy_dunk_mystery_skin_7542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470027/normal_5fd6721fe5ef5.pdfIn PDF document text
    • https://cdn.sqhk.co/mojafefegamo/b3jgjc8/bisagerepozuxagawegurur.pdfIn PDF document text
    • https://rawadawopi.weebly.com/uploads/1/3/0/8/130874142/velirepija.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/wopari/unctad_least_developed_countries_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/43030937633.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/the_rise_of_afrikaner_nationalism_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/sevexaxeluvowuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/35508332526.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_off000112eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EB 4588 bytes
SHA-256: 18661da8b8b7e6874a95a4635e8fda48c2ec69bd3467013d5e8e62d4c0899446
font_01_sfnt_off000122b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B0 10116 bytes
SHA-256: d67d090ba0a55502ab3b164b36eda8b86a18c3bb13c48de0a399c588821949da

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