Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b9f825c3e9f17d…

MALICIOUS

PDF

77.0 KB Created: 2021-01-30 06:41:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f77f1d316544f9ef6b4a8c876005cf25 SHA-1: 355078ec28ddd7b3738ac72f3416e834f9d16583 SHA-256: a6b9f825c3e9f17d9907014f5bef6675c5b3a641e3b029b98ef9156efef57faa
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and 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 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/aws?utm_term=english+pronunciation+guide+for+chinese+speakers PDF link annotation
    • http://ipoteka.net/78931336621o01dm.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/kiwozame0cehn.pdfIn PDF document text
    • https://damaxebibotewud.weebly.com/uploads/1/3/2/6/132682848/lukepagujubar_botevokowivuxol_lupipaloki.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/aQBhChg/significado_de_preludio_en_espanol.pdfIn PDF document text
    • https://petominezejoza.weebly.com/uploads/1/3/2/3/132303337/88a1a1e5f.pdfIn PDF document text
    • http://iblack.space/tisufizebalipuza6g7a.pdfIn PDF document text
    • https://cdn.sqhk.co/wefonasifaza/hcijjjh/classic_battleship_game_pieces.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/barom-birotatala-notuvezegep-zidunuduti.pdfIn PDF document text
    • https://cdn.sqhk.co/jitolado/iejfibn/tripp_trapp_newborn_set_grey.pdfIn PDF document text
    • https://dunawotota.weebly.com/uploads/1/3/1/4/131438316/2b22ee38d8.pdfIn PDF document text
    • https://cdn.sqhk.co/junizafuzep/Wuidiji/jorogefazonibewif.pdfIn PDF document text
    • https://cdn.sqhk.co/danopefasuf/gochbHr/23074537451.pdfIn PDF document text
    • http://jegipebor.iblogger.org/dbq_focus_atlantic_slave_trade_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465935/normal_5ff19bc42840a.pdfIn PDF document text
    • http://larts.digital/mx_player_codec_armv7_neon_1._13._2l1yq2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378853/normal_600e799c20288.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuzimobikuxuta.epizy.com/66265140817.pdfIn PDF document text
    • http://semiwexojexudu.epizy.com/devotional_songs_telugu_video_free.pdfIn PDF document text
    • http://jixepewix.epizy.com/beauty_and_the_beast_broadway_ost.pdfIn PDF document text
    • http://lumuwejonalar.epizy.com/ajax_type_post_enctype_multipart_form-_data.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_off0000ef92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 5436 bytes
SHA-256: 27d5c60b71f095be8531fdfcf1f18e92038fa6fe7d3de9d3e08f3bef73f3da3b
font_01_sfnt_off00010217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 10592 bytes
SHA-256: 60d6ac61f5c247562f713a4995f76b0788c47fb94d5827813c099a2462a65350

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