Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31756dc7d99822e…

MALICIOUS

PDF

85.2 KB Created: 2021-03-11 02:59:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: afe9e70e81e4284302cebe61d692b7d8 SHA-1: 0e3d469a7228645bd2061c2bce393528a986badd SHA-256: f31756dc7d99822e1bc4763f63bdbd490be369bb0cdf200c26ab027b183456cd
176 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to a download link. The presence of a password-protected archive lure suggests an attempt to bypass security scanning. ClamAV detection further confirms its malicious nature, classifying it as Pdf.Phishing.Trojan. The primary malicious URL identified is https://botokaw.ru/123?utm_term=quest%25C3%25B5es+resolvidas+de+an%25C3%25A1lise+combinat%25C3%25B3ria+em+pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://botokaw.ru/123?utm_term=quest%25C3%25B5es+resolvidas+de+an%25C3%25A1lise+combinat%25C3%25B3ria+em+pdf PDF link annotation
    • http://jidapuxedepu.medianewsonline.com/intraday_trading_strategies_in_indian_stock_market.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460954/normal_5fcf603f5e1fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455914/normal_5ff660e61f94a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413112/normal_602628a5a4567.pdfIn PDF document text
    • http://rekipeva.iblogger.org/luzumerazoxejokaxiv.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/netgear_gs108pev3_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391008/normal_6032c10a5c45c.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/paxevug.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/13344150850.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_538c59c8e5ca48fb92dfe91ad1f5bdfb.pdf?index=trueIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_141f4bff01e046cfbd9041bd9b5f1e23.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/what_to_do_to_lose_weight_in_15_days.pdfIn PDF document text
    • http://soranodabiwegi.myartsonline.com/83337176690.pdfIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_476e4f08d7a049de9109867dbe6646b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/besafefaf/12061277889.pdfIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_a290e6efca6643889e597424d54c7a36.pdf?index=trueIn PDF document text
    • http://nuwumexuxesi.epizy.com/sheet_music_blank_lines.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/4th_grade_multiplication_math_facts_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/checkbox_google_sheets.pdfIn PDF document text
    • http://duxepivol.myartsonline.com/the_egypt_game_summary_chapter_6.pdfIn PDF document text
    • http://zifopodisinuri.rf.gd/atharv_raut_photography_background.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 6152 bytes
SHA-256: 20068735c5b55deedac19f95cf11900dcbab545323b95ad37bfe620958b51920
font_01_sfnt_off0001046c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046C 13612 bytes
SHA-256: 0438bad1c6f362c1107f9a2fb33b544769b717c9c7eee036a04368d77c6ecd4f
font_02_sfnt_off00012e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7A 16312 bytes
SHA-256: 6bf874c99afd280c8b5d83459a72e6afed4f1b7c78e4afa2e5a03530a0513986