Malicious PDF — malware analysis report

Static analysis result for SHA-256 3809bd8a8cc15929…

MALICIOUS

PDF

44.1 KB Created: 2020-11-09 07:03:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e99a5c50c4ad5857f7507d8b2d3582e9 SHA-1: 9525307fa74e7c180031e666df27a03c5bcaee75 SHA-256: 3809bd8a8cc1592956cde2e6bfc3947dbbd2988d082b3d81834fa9c00658bc7a
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was identified as malicious by an ML classifier and contains a large number of external links, indicating it is part of a link farm. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The presence of numerous external links suggests an attempt to redirect users to potentially harmful websites, likely for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafficel.ru/123?keyword=valentines+day+quotes+for+kids PDF link annotation
    • https://gilolubirej.weebly.com/uploads/1/3/4/3/134309297/477297d5c26cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455195/normal_5f9fe5c1bcd71.pdfIn PDF document text
    • https://neluposu.weebly.com/uploads/1/3/4/3/134369170/3251595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374835/normal_5fa5932040b3a.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/rujimidujek/3867490204.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/girimuxamikimisut.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/sindrome_de_abstinencia_al_alcohol.pdfIn PDF document text
    • https://lusabun.files.wordpress.com/2020/11/saxon_math_7_6.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/susquehanna_township_high_school_soccer.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/free_health_coaching_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2d21af5-ec61-40f7-8109-a08e4d56c9b3/jivomul.pdfIn PDF document text
    • https://nazoteviv.files.wordpress.com/2020/11/29426992894.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/vemifodezino.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/wings_of_fire_book_download_in_marathi.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_off00006d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6A 5156 bytes
SHA-256: 849710fa772282842e89f533d0c6b9c88b246d26735f542a153478a3e29cf535
font_01_sfnt_off00007f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F11 10960 bytes
SHA-256: 747c247c9c001d23c8e95b3ad58e4ef35a5eae3fd8bf5e4ad355b26feff01965

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