Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a59ead6a92280a7…

MALICIOUS

PDF

79.6 KB Created: 2021-03-29 04:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 43486db8c227cd3dac0097a651c0286d SHA-1: ef197b63607ba1741ee7d5ff811492b9be20be89 SHA-256: 3a59ead6a92280a732f7aa7778d990a1300d0a7c6219b69806fdc0b21a08d402
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ponafet.ru/award?keyword=calendario+settembre+2020+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491936/normal_603946b07cb22.pdfIn PDF document text
    • http://puwuditufu.22web.org/xbox_360_jtag_beginners_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365628/normal_5ff4cc7499189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385631/normal_600e40a6dd306.pdfIn PDF document text
    • http://tryplafond.xyz/netewuxuzesajve6gi.pdfIn PDF document text
    • https://cdn.sqhk.co/zimamoko/QShhggi/64392053663.pdfIn PDF document text
    • http://smirnoff-optic.com/xujuguvw5cp.pdfIn PDF document text
    • http://famojefefe.iblogger.org/alvida_ramzan_pics.pdfIn PDF document text
    • https://cdn.sqhk.co/tijanukubo/5ijhiha/vafixifudimux.pdfIn PDF document text
    • http://pomirkapa.site/poe_delve_achievements_guidecr3i7.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/chiChLu/amazement_synonyms_word.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444636/normal_5fef40ff3ea80.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f776732a-4c78-4cf5-bd2e-4d9d13741467/goal_setting_worksheet_for_students_doc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfc7a15a-8df3-48f2-8ee5-683601bc2b8b/would.you_rather_questions_hard.pdfIn PDF document text
    • http://xiparokenozi.epizy.com/nologulovonofodida.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/guided_reading_lesson_template.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/59170284271.pdfIn PDF document text
    • http://zawuzujuw.epizy.com/68421739547.pdfIn PDF document text
    • http://lugavatakavupo.rf.gd/26917083044.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 5412 bytes
SHA-256: 273e5ed8e7d7179c6a9d6a6043ea851aa9cf6c0f844f42cc2fbb358fc96047d3
font_01_sfnt_off0000fead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAD 11416 bytes
SHA-256: 5b7acc2c70121df9d7c90076077ae091be6603fbde7e1f054795463304b0f869
font_02_sfnt_off0001245e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3