Malicious PDF — malware analysis report

Static analysis result for SHA-256 39416e0e954a9e64…

MALICIOUS

PDF

69.9 KB Created: 2020-11-14 06:40:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: af328a5498a589d013e5f5734d6e7064 SHA-1: 10e2e001ee6a49ac605b89249f59a539b89428db SHA-256: 39416e0e954a9e645656d7e519d58d63de1970a2ae080d845fb183b4655c42ae
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a common tactic for SEO poisoning or redirecting users to malicious sites. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, with one pointing to a suspicious domain. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded links.

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://trafffi.ru/aws?utm_term=free+online+pdf+editor+without PDF link annotation
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/4144282.pdfIn PDF document text
    • https://bidutujube.weebly.com/uploads/1/3/4/4/134403342/4281772.pdfIn PDF document text
    • https://didilajuti.weebly.com/uploads/1/3/4/5/134585724/wodasigalujad.pdfIn PDF document text
    • https://xufetujada.weebly.com/uploads/1/3/4/7/134745175/ratoruripeti.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/suzixegazunow/tape_measure_with_fractions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84262da7-cd8f-4895-83e1-ba47f33e6b57/vuboted.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/encyclopedia_of_general_knowledge_download.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/bodybuilding_diet_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/54369855894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30435547-be25-49d0-8a12-22d1b70563b5/74091946463.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/botany_morphology_of_flowering_plants_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85e4b8fc-21a2-4244-9989-74bff67ff4ba/rabivesezetedutu.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_off0000d4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D1 4788 bytes
SHA-256: 3944f35003ecc008baae9eb006a2e28f0d490a61a40a40c3065e1c3537330eac
font_01_sfnt_off0000e527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE527 11064 bytes
SHA-256: ecad8d4925c49801b547eca7b0a7b05a40874372218191a4a93d670ba3846eea

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