Malicious PDF — malware analysis report

Static analysis result for SHA-256 435d1579c6e28853…

MALICIOUS

PDF

78.5 KB Created: 2021-02-08 18:03:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c7dce93e3f55c4a753ea1cef8810b338 SHA-1: abfcc23116cbf4b01195da55632abb72c9bf2ba4 SHA-256: 435d1579c6e2885323807a9c20b613fe2abf15c2682f71118b7c362d5903f285
136 Risk Score

Malware Insights

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

The sample is a PDF document that employs an image lure to redirect users to a phishing website, as indicated by the 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristic. The primary malicious URL identified is https://druttle.ru/123?utm_term=frigidaire+range+f11+error. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt, aligning with the 'Pdf.Phishing.Trojan' ClamAV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://druttle.ru/123?utm_term=frigidaire+range+f11+error PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483856/normal_6015b28a204ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485800/normal_60024ea76c64a.pdfIn PDF document text
    • https://dabamupusoga.weebly.com/uploads/1/3/4/2/134265366/7317102.pdfIn PDF document text
    • http://ig-copyrightviolation.com/texas_comptroller_annual_reports3y9i.pdfIn PDF document text
    • https://bogezozoxo.weebly.com/uploads/1/3/4/4/134479702/tikomepad_xunozenepapasa.pdfIn PDF document text
    • https://mopijijexexer.weebly.com/uploads/1/3/1/8/131871517/nemiroxax_welogafigetov.pdfIn PDF document text
    • https://kakowafalajoji.weebly.com/uploads/1/3/4/4/134455686/ronuzip.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/67775704088dq320.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473053/normal_5ffb44d77068e.pdfIn PDF document text
    • http://kuxogajow.iblogger.org/esl_english_worksheets_printable.pdfIn PDF document text
    • https://detopeda.weebly.com/uploads/1/3/4/3/134305225/sisefemobifedugomiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420020/normal_600d789584cf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421201/normal_60199f6663109.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445334/normal_6000c8ac14d51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bezutu/pivaweriponovowadekudege.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/kempsey_stock_and_land_market_report.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/chapter_books_for_guided_reading_level_g.pdfIn PDF document text
    • http://nozodozijido.epizy.com/zuxeruvuduninegoget.pdfIn PDF document text
    • http://lenixad.epizy.com/occupational_health_and_safety_ppt_template.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/rotorua_cinema_guide.pdfIn PDF document text
    • http://sawezigulafufa.epizy.com/which_report_is_better_carfax_or_autocheck.pdfIn PDF document text
    • http://renedutej.rf.gd/3937233698.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1D 4580 bytes
SHA-256: a6f5c637d99ce10b866376afffcd334b95dece0c9eac34308e435f1e11b4cda6
font_01_sfnt_off0000f9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B1 10716 bytes
SHA-256: 0032b8492306945f0bc2ba335c0a0bbea905456cc1e19809f7e0f9bb1b67d106
font_02_sfnt_off00011e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e