Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6d4510818149cf…

MALICIOUS

PDF

67.1 KB Created: 2020-12-07 19:39:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1532a75fd2846fa57f0ada4457c1bb84 SHA-1: 984db98ba51f0216af5b1b12a52f625ffb953e76 SHA-256: bd6d4510818149cf7f584093488735af2b28f915d4e62252f3c7392d84e05b7a
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://trafftec.ru/123?utm_term=formation+of+alcohols+by+the+hydroboration-oxidation+sequence PDF link annotation
    • https://lafefozusut.weebly.com/uploads/1/3/4/5/134597047/87e5dfb7ab2.pdfIn PDF document text
    • https://sixexarujizevav.weebly.com/uploads/1/3/4/5/134584368/mufakopo.pdfIn PDF document text
    • https://mizanupiw.weebly.com/uploads/1/3/4/2/134265802/f894bc25fd5c31a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465709/normal_5fc51f9c1620b.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/0d3d55b6-b279-492c-b05c-eaaa87bae461/vorafuboxajamixudar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a80e347e-741d-443a-b425-586aeee79ecf/russian_pro_female_bodybuilder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3ac5e36-7dd8-43ec-8cf5-7988f86eabc4/98347763605.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc529e012facd59cec8ad00/t/5fc601ae08845d092459544f/1606812078565/saredivuw.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc514f6bf71053ccb2ab590/t/5fc76ab21d689b68bf9be557/1606904498895/snake_puzzle_ball.pdfIn PDF document text
    • https://s3.amazonaws.com/padoragog/33404015343.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc104e3405d5340f32a388f/t/5fc9ff411a258d244fe36a2b/1607073602694/bowovivawuge.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc78103717a0f60c403be08/t/5fcddbea05ddc9599d442b40/1607326699474/wixumevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31dfaa10-f651-4ecb-bc8f-c26d1cfdb0c6/71384836477.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5aa7fd26ff1194f946b85/t/5fca52cd228bd44a469bb376/1607094989778/60172094686.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/bmrcl_key_answers_2017.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_off0000c8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F0 5684 bytes
SHA-256: 17ffc86665412893ff044851ac05e8cf0f0d3b8717730ff29a3cbace9bb49e6e
font_01_sfnt_off0000dc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC23 10224 bytes
SHA-256: 8035adee255259e743bd9a2ad6819b96324c1cf6132343e05abf887c3afc86bd

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