Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d813034bab80308…

MALICIOUS

PDF

76.3 KB Created: 2021-03-15 21:24:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f482e8491335c06e9033604ad3029a1 SHA-1: dc3a4a4234e82781c391320639a8d60666e94df8 SHA-256: 3d813034bab80308db45cbf9e822679ed39d3a8f58c08f2cf7b8c247b281ff7d
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a link farm on disposable hosting. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains keywords that suggest a lure related to medical information, likely to entice clicks to the malicious URL.

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 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://nipisod.ru/award?keyword=proteinuria+adalah+pdf
    • https://cdn-cms.f-static.net/uploads/4495251/normal_604b1b1833d4b.pdf
    • https://static.s123-cdn-static.com/uploads/4500001/normal_5fedfffa0d609.pdf
    • https://cdn.sqhk.co/desogepupema/iczidib/video_editor_with_music_app_android.pdf
    • https://cdn.sqhk.co/fedovipawe/Ujgichf/dead_city_zombie_invasion_mod_apk_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4489740/normal_603352a6e3cdf.pdf
    • http://maxonona.22web.org/mepozixemumuvofigeruw.pdf
    • https://cdn.sqhk.co/riluvexudeve/d8iighc/beruwakexanunekomanax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/regegozumekoza/cell_block_cytology.pdf
    • https://s3.amazonaws.com/jolituzoji/66059738135.pdf
    • http://nowoduxer.rf.gd/12140915723.pdf
    • https://uploads.strikinglycdn.com/files/308a40f7-0374-4a5b-8d27-5a5adf1dee92/how_do_you_program_a_honeywell_thermostat.pdf
    • http://getuwakuwevideg.epizy.com/lozopaseromiweginaz.pdf
    • https://s3.amazonaws.com/lijopavexanuse/musical_scores.pdf
    • https://s3.amazonaws.com/megujobemegor/grade_10_math_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/83a6bc00-0c85-4925-92c9-1a3798dea706/ikea_catalogue_2020_australia.pdf
    • http://magivaxinel.rf.gd/boronia_park_public_school_uniform.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/wd_my_cloud_storage_4tb.pdf
    • https://s3.amazonaws.com/rexogeguxosix/59268999165.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f671.bin
17dff8aa51180129811fcfbbbb895987d73dd6ea4cfd29d3b24d4fd601ec8303
pdf-font-stream PDF embedded font (sfnt) at offset 0xF671 4952 bytes
font_01_sfnt_off0001073e.bin
9b6e71137bc2ad3b511e122e5908ed5a9205d0eafe0476ce17c0b1d3ae796aec
pdf-font-stream PDF embedded font (sfnt) at offset 0x1073E 10496 bytes