Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ec781a4f341d7d…

MALICIOUS

PDF

81.9 KB Created: 2021-03-22 23:10:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 21642b2cf1dc2f7a55adcdefa73ed0e6 SHA-1: a374382d5e9740272729b78b1c2e2f86d954a2a3 SHA-256: b0ec781a4f341d7ddde117a5b55f881f652b07f2fbaee0b6ad00a80ba25a9475
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on disposable domains, with numerous external URIs pointing to potentially malicious content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of multiple external links reinforces the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/123?utm_term=correlazione+tra+anemia+falciforme+e+malaria PDF link annotation
    • http://tobufupevujuma.mygamesonline.org/81965269547.pdfIn PDF document text
    • http://dutuvowori.22web.org/blomberg_washing_machine_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/tobipamu/V8gjVhf/73104153538.pdfIn PDF document text
    • http://nigemutekilum.mypressonline.com/rational_numbers_class_7_questions.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/how_do_you_program_a_genie_promax_garage_door_opener.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/ifWjbsp/glossy_slime_simulator_satisfying_diy_games_apk.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/koderiju.pdfIn PDF document text
    • http://pewodebepefawi.scienceontheweb.net/21237028320.pdfIn PDF document text
    • http://zanodopowe.sportsontheweb.net/73813240781.pdfIn PDF document text
    • https://cdn.sqhk.co/bukoxomule/Phdhdjh/37330771664.pdfIn PDF document text
    • http://kekijojovif.sportsontheweb.net/32438421502.pdfIn PDF document text
    • https://cdn.sqhk.co/rebamomidaw/iQQwj9E/ice_cream_truck_jingle_lyrics.pdfIn PDF document text
    • http://nigigalewo.iblogger.org/mixatu.pdfIn PDF document text
    • http://sebevifa.getenjoyment.net/adjective_worksheet_grade_7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fogaduvese.epizy.com/medodizojuma.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/bio_data_form_free_download.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/48886433239.pdfIn PDF document text
    • http://nosifunugiwes.epizy.com/norinumuvexilafexiwovuk.pdfIn PDF document text
    • http://fowimifefezujo.myartsonline.com/bobekeba.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/carex_handwash_safety_data_sheet_uk.pdfIn PDF document text
    • http://damatagowigiz.epizy.com/free_online_bejeweled_3_games_no.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/convert_kindle_to_epub_android.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_off00010170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 4804 bytes
SHA-256: 9a4f211bf0624163c851f2eba4f4630d07f30efea5019ce8fefeda697f2e6458
font_01_sfnt_off000111b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B7 12328 bytes
SHA-256: ad6bda5d1ab87404064c1f525b123a0fa958ce230a59b4360748c1fdd593cb7d

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