Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38bfd74786ae8e5…

MALICIOUS

PDF

74.9 KB Created: 2021-01-30 22:51:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c93c04c8b58071fe1ce0f052b328dfee SHA-1: 96177b4f79c6eed6aee71192a628f36df0a395a9 SHA-256: f38bfd74786ae8e59752d26733aa393e94678ec6dd666c35932a50683499fb00
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a significant number pointing to disposable domains and link farms, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=business+ethics+books+pdf PDF link annotation
    • http://trelon.fun/45150219053wsfuj.pdfIn PDF document text
    • http://tokigarodam.22web.org/android_10_mi_a2_lite.pdfIn PDF document text
    • http://copyrightprivacy.site/taxoduxafaperkxzsk.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/1rX1tMQ/top_40_hits_radio_online_free.pdfIn PDF document text
    • http://bitcoins-profits.com/hopital_pix_96eqg0.pdfIn PDF document text
    • http://hydraruzxpnew4af.exchange/12302418863w56os.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/hd8jjgi/my_sprint_rewards_me_login.pdfIn PDF document text
    • https://cdn.sqhk.co/lupokuna/BichaXJ/53303657975.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sakigekoxigukil.epizy.com/php_experienced_interview_questions_and_answers.pdfIn PDF document text
    • http://xevikosurozogin.rf.gd/caltrans_standard_specifications_2015.pdfIn PDF document text
    • http://makuwuwamev.rf.gd/iceland_volcano_news_report.pdfIn PDF document text
    • http://mowumaja.epizy.com/direct_and_indirect_characterization.pdfIn PDF document text
    • http://punolubumima.epizy.com/birth_plan_template_nsw.pdfIn PDF document text
    • http://kobepok.epizy.com/the_ugly_duckling_hans_christian_andersen.pdfIn PDF document text
    • http://fukasutatota.rf.gd/pupakikinizilonaso.pdfIn PDF document text
    • http://biguvuxurezuto.epizy.com/waxix.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/tata_sky_android_app_apk_free.pdfIn PDF document text
    • http://dufeniwa.rf.gd/womew.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_off0000ebce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 5160 bytes
SHA-256: 52a6e3df40ded7b94c5daa012dc28dd2377316fcab64bf2b542b8a7696d2210e
font_01_sfnt_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 9640 bytes
SHA-256: 20dbabd6031f2902c73d8bed9ebf69be38e242d660d29b3992c441b6a8f24b34

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