Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4dfc586f6888e17…

MALICIOUS

PDF

194.2 KB Created: 2021-03-06 10:27:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 733ceaacaeb53eee1c830d9962d3dbf0 SHA-1: 984d667118675ddc146a1338b01e3267211492a5 SHA-256: b4dfc586f6888e177a4c4da64d635f2180b7f4e62100da8c898b22e62130b2e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://fokemale.ru/123?utm_term=tangerine+dream+oedipus+tyrannus+youtube PDF link annotation
    • http://xuwuvewisin.mypressonline.com/what_is_the_main_difference_between_an_llc_and_a_corporation.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/the_tempest_sparknotes.pdfIn PDF document text
    • http://reduslim-italia.website/usanetwork_activate_nbc_fire_tvd5sdk.pdfIn PDF document text
    • http://secret-empire.ru/how_to_combine_like_terms_with_different_exponentsrg9q0.pdfIn PDF document text
    • http://santecmb-sarl.com/54399935709a2guq.pdfIn PDF document text
    • http://italysummer.space/8-_7_practice_dilations_form_g_answersyq3kt.pdfIn PDF document text
    • http://toportt.online/3879516499lmj37.pdfIn PDF document text
    • http://erogan-oficial.site/tideromimakebaqoqe.pdfIn PDF document text
    • http://accueilcmb.com/black_ice_cream_coneybw59.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c84271d-1622-42cc-9b96-29ec83ce4d9f/98701580225.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/9650628177.pdfIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_253bf9afb86b40218b3af20b92a351ad.pdf?index=trueIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_b0ef4408f8a84d4e9e04982c77bf1264.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5f932ff-f30f-4ee2-a394-100e33651ecb/robin_hood_disney_full_movie_free.pdfIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_cd61d5fbcf4d4ce59d4d4b9ff137568b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/43698277596.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/what_was_the_cause_of_the_depression_in_1929.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/yankee_doodle_boy_piano_sheet_music.pdfIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_68aec679b79345e281a8685d7633f131.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/20b3c825-b091-465a-8d68-d41ca9916b1e/is_jojo_part_6_going_to_be_animated.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03af654c-ffa4-4e4a-aa9a-92da4667972d/what_does_seraph_mean_example.pdfIn PDF document text
    • http://rijemow.onlinewebshop.net/how_to_find_uncleared_checks_in_quickbooks.pdfIn PDF document text
    • https://1b2c4efd-c8eb-4b04-b26f-b9154d704720.filesusr.com/ugd/d3758e_42d6bebb4ec44607bf6fa723766097b8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/tizoju.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_off0002bbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BBF7 5436 bytes
SHA-256: 024b2608468c7b1b3d5756d5caec4baaa12e635a30a2938b6762807aef47b8f9
font_01_sfnt_off0002ce63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CE63 14196 bytes
SHA-256: 439dfa5d619caa53e4e7515948d27297e40f158fcefa26e8eed20d06f1b08f0c