Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c0a49f0d6f2e90…

MALICIOUS

PDF

76.6 KB Created: 2021-03-07 11:37:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 646b68969850ad824a25411f209b561c SHA-1: e0e056489d18903ad9a12e62c5b1e39b4b671f29 SHA-256: 38c0a49f0d6f2e90d70c868dcd90304f068eefff849c0ff4fb17cd2fccb21653
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mezovuduw.ru/wix?keyword=lesson+11.1+similar+polygons+answer+key PDF link annotation
    • https://cdn.sqhk.co/torujazelome/lOnl3ic/6741491022.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444386/normal_5fc6b914a3945.pdfIn PDF document text
    • https://cdn.sqhk.co/xedogigiloli/ij7pji1/green_color_splash_white_background.pdfIn PDF document text
    • http://mon-fortuneo.best/cheerleader_trumpet_sheet_music_freebv6bp.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/hihciaQ/nufidedivuzefumosulav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451927/normal_60332f1b78bc8.pdfIn PDF document text
    • http://moviesaddaa.online/zuvezufibuzzr1gp.pdfIn PDF document text
    • http://outputqwvk.space/whirlpool_quiet_partner_ii_flashing_clean_lightata6g.pdfIn PDF document text
    • https://diwolusetu.weebly.com/uploads/1/3/5/2/135299278/713daf.pdfIn PDF document text
    • https://debasomi.weebly.com/uploads/1/3/0/7/130739769/8799971.pdfIn PDF document text
    • https://litisenos.weebly.com/uploads/1/3/1/0/131071047/jazaxulorena.pdfIn PDF document text
    • https://cdn.sqhk.co/dogilijesiwu/aghKHid/undertale_battle_simulator_play_online.pdfIn PDF document text
    • https://cdn.sqhk.co/wikelere/Sjhriey/rilirepojuduboradaxifo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393762/normal_5fee088974393.pdfIn PDF document text
    • http://stavki-na-sport.site/calculator_vault_apk_for_pcpi5i7.pdfIn PDF document text
    • https://cdn.sqhk.co/wexopaxine/eiciabK/90263686810.pdfIn PDF document text
    • https://cdn.sqhk.co/samumosoxivi/eNhegcZ/dinosaur_zookeeper_android.pdfIn PDF document text
    • https://xolopebowuraj.weebly.com/uploads/1/3/4/6/134600193/1562167.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_2fcf932097364237abe7f961027d6838.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_bd404b7b1feb4354bd207e8d6e0c9b26.pdf?index=trueIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_e8387aa83ea249be95089fc7bf8a77a8.pdf?index=trueIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_666cd2bb45c54a6bb34124c80e9db530.pdf?index=trueIn PDF document text
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_9765bd51b468431487e14e40b26db13a.pdf?index=trueIn 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_off0000ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 5424 bytes
SHA-256: 3c98b08b12e557640959d2e65aaea9861b2aa47dd638b37cd239a8f16ce0cc68
font_01_sfnt_off0000ff79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 10888 bytes
SHA-256: 1d7778ff093a7e6e1c8cfd7f78fc3ff6bc3222e656db702f062a28d3a4a2a041