Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73d6efa1953f3cc…

MALICIOUS

PDF

102.0 KB Created: 2021-02-23 06:56:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c9ca13177eab0644ad0debd963d31a90 SHA-1: e11d43187f747e202a15bd8279227e4a70397ba3 SHA-256: d73d6efa1953f3cc7d75d6aa68f51653e118616fbeceb2acfdae76056c2f8c2b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/aws?utm_term=cloudy+with+a+chance+of+meatballs+cast+two PDF link annotation
    • http://teasmall.space/sign_and_symptoms_of_myocardial_infarctiongczja.pdfIn PDF document text
    • http://whalesqpa.fun/155192478924szel.pdfIn PDF document text
    • http://denizan.com/how_to_connect_a_universal_remote_to_a_sansui_tvv1xq1.pdfIn PDF document text
    • http://tryraisins.pro/xuzodopamobed28j.pdfIn PDF document text
    • http://repair-monokoles.ru/kekosogubipe9hook.pdfIn PDF document text
    • http://fruit-citrus.space/eliphas_levi_deutschkbm5y.pdfIn PDF document text
    • http://optarfes.com/dungeons_and_dragons_3.5_fiend_foliop1thp.pdfIn PDF document text
    • http://xobezised.iblogger.org/landing_page_wordpress_free.pdfIn PDF document text
    • http://detonic-italy.website/nujebitqfyl.pdfIn PDF document text
    • http://xewosaxebojufir.iblogger.org/banuzidavurudop.pdfIn PDF document text
    • http://msertis.xyz/reading_comprehension_strategies_worksheets_middle_schoolcpvkk.pdfIn PDF document text
    • http://websporizlehd.com/221844563791b4ch.pdfIn PDF document text
    • http://smotrikino.fun/dark_souls_2_cheat_engine_item_discoveryih6tu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojetewope.epizy.com/80741212403.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/pezojawajopozib.pdfIn PDF document text
    • http://sijugisuvaf.epizy.com/fejeganatira.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/gangstar_city_game_apk.pdfIn PDF document text
    • http://fekofenuxekit.rf.gd/13600541817.pdfIn PDF document text
    • http://disigulopenanij.rf.gd/tujoke.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/67808364856.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_off0001511b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1511B 5404 bytes
SHA-256: 9534690625c6fa9849ff507e93c5e5f830f6f0a5fa12dc472203cf9e1d6d9635
font_01_sfnt_off00016371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16371 11472 bytes
SHA-256: 3724ec87d2359fa3c72c9597b58c90a46bcd0dd80831bc04644176779571b3b4

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