Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f46dd2604fce797…

MALICIOUS

PDF

68.2 KB Created: 2021-02-21 05:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: da3876ec602a2d0d1877e702d9b417ba SHA-1: 72d6a8c164f1184790bec63de3ac84682bb1399d SHA-256: 3f46dd2604fce797f9fbaf0c9bcb4a0ebccd4fbaa5afdebc32fc8ddaca603ec0
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded links, with at least one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text fragments that may be part of a lure. The presence of malicious redirector links suggests an intent to phish for credentials or deliver further malware. No scripts were extracted from this sample.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=aa%20traffic%20in%20my%20area In PDF document text
    • http://wivafojoki.22web.org/bootable_kali_linux_usb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374686/normal_5feb0d7b7eca4.pdfIn PDF document text
    • http://jejunobu.iblogger.org/wiraselilosufapixazo.pdfIn PDF document text
    • http://wavasesinile.22web.org/kelevupobanawumovijagozo.pdfIn PDF document text
    • http://wirelosine.22web.org/integrated_math_2_student_journal_answers.pdfIn PDF document text
    • http://vewazovowev.iblogger.org/23669365643.pdfIn PDF document text
    • https://cdn.sqhk.co/sofuxizago/4gfifbk/22719840214.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417656/normal_60049b7f40d41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446395/normal_60034c1ef0812.pdfIn PDF document text
    • http://kiregatikutofun.22web.org/8032875166.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gaposajalumawes.rf.gd/maytag_quiet_series_100_specifications.pdfIn PDF document text
    • http://toririli.rf.gd/national_lottery_draw_history.pdfIn PDF document text
    • http://morufigalolo.rf.gd/19602535177.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/zarchiver_latest_version.pdfIn PDF document text
    • http://walefofu.rf.gd/free_lattice_math_worksheets.pdfIn PDF document text
    • http://fezivepe.rf.gd/media_as_agents_of_socialization.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/65920476988.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/98003037747.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_off0000cef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF0 4908 bytes
SHA-256: 23757eaf952ab5a8e8e8a10bdb6a4a215ba796f61494a7e2a3ae5fbd0281c28f
font_01_sfnt_off0000df9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 10748 bytes
SHA-256: 524563a2dafa0a84ddc67b0cb76ba9bb37142d1b5a79f9b655aec9c82490c244

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