Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0bce73785b5e1a5…

MALICIOUS

PDF

82.5 KB Created: 2021-04-29 10:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6d1f2db78e2e723232720656eeac52ca SHA-1: cf0c02cb900b79406b6b4589a92d46bf1796030a SHA-256: d0bce73785b5e1a586570f534e08ee32310eb096f38c1a38d2a1a034f35dc6cf
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is structured as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, appears to contain keywords related to search queries, reinforcing the lure-based attack pattern.

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://lozipotod.ru/strik?utm_term=how+to+program+clicker+brand+garage+door+keypad PDF link annotation
    • http://salonhq.xyz/3rd_grade_vocabulary_activities2aw93.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/organelos_celulares_y_sus_funciones.pdfIn PDF document text
    • http://nikibolerobika.getenjoyment.net/international_standards_on_auditing_volume_3.pdfIn PDF document text
    • http://retamos.mygamesonline.org/pdf_alternator_manual.pdfIn PDF document text
    • http://suporefebakibur.mygamesonline.org/29258913382.pdfIn PDF document text
    • http://crysety.xyz/julavekofomavovo09r3f.pdfIn PDF document text
    • http://nedavupagisezim.mygamesonline.org/how_to_change_the_date_on_a_marathon_wr50m_watch.pdfIn PDF document text
    • http://uber-global.com/475772974417ysif.pdfIn PDF document text
    • http://tarigutese.mygamesonline.org/bihar_si_mains_question_paper.pdfIn PDF document text
    • http://volupixo.mygamesonline.org/the_adventures_of_tom_sawyer_full_text.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/shake_shack_menu_prices.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/blindness_jose_saramago.pdfIn PDF document text
    • http://matawobedopikam.mywebcommunity.org/lumujopikugadepibejetid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rosajeku.myartsonline.com/xafiw.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/98660340495.pdfIn PDF document text
    • http://tivexedasabuxi.myartsonline.com/personality_psychology_understanding_yourself_and_others.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/74262477099.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/the_umbrella_academy_comic_vanya_and_diego.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/carlisle_weather_report_pennsylvania.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_off000103c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C1 5576 bytes
SHA-256: 067418de36f5be22cd1f007707567e05b4ac0ba62767bb0db043b9a0f973db0c
font_01_sfnt_off000116b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B4 11136 bytes
SHA-256: 7dd76aa2e1b45c059699f2092a8c5361d3a058ac89b0abd886880f430012d0f9

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