Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3c1d582cb00a80…

MALICIOUS

PDF

69.0 KB Created: 2021-04-01 02:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0815bb12d8d9a3b155bf3f7c5e422698 SHA-1: 20541a5533559de25580138119e4fbc73d02a551 SHA-256: 8c3c1d582cb00a805cd96c1859c94044ea46e48f0d5fe67b9b7ec28a913c45f6
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://kuzutuzo.ru/award?keyword=pinel+biopsychology+pdf+download PDF link annotation
    • https://cdn.sqhk.co/wixadigizal/RA4Xz0J/jubibuvonebekiriki.pdfIn PDF document text
    • https://cdn.sqhk.co/sowanigog/JN1JXhg/super_mario_bros_pixel_game_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373788/normal_5fcfb8e50c3fc.pdfIn PDF document text
    • https://cdn.sqhk.co/guwewaxa/b0qEyia/jbl_bluetooth_stereo_speakers.pdfIn PDF document text
    • https://fopulowaledini.weebly.com/uploads/1/3/1/6/131637921/zovonizul_raseziwa_kuxenosilagasi_suvinivu.pdfIn PDF document text
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/2318122.pdfIn PDF document text
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/f6cc1bc50ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460709/normal_5fec1550107e9.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/liwafo/brush_stroke_brushes_photoshop_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/komegupuzuwomuxulazaf.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/rutuwesozonibosijol.pdfIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_d59473834ce64bd49624c83b70716a79.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovilowab/evaporating_cloud_template.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_612fcac25b9941548c0f8dbdb1632fa1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/what_are_the_examples_of_research_proposal.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/adobe_camera_raw_file.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/89592618559.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_off0000cfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC6 5656 bytes
SHA-256: 550afc04d21ab6c65af0bd3c3227997fd6aa138da39e885359292058999330e7
font_01_sfnt_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 10328 bytes
SHA-256: 896873663ea6a3fa2a81267b21c9295cd62527b54157f4dfa9c752f5bdc1d6e4

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