Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9285c43ab7dedce…

MALICIOUS

PDF

72.7 KB Created: 2021-06-05 10:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4e1ec86d27087987b8e37a0bd554febc SHA-1: 98c95b7ab7d612e34b415ba3b647925be6166e4d SHA-256: b9285c43ab7dedced8d01a2138a65486934236fcd5b4db4f4df1eeca9cf60bb2
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 0.9993

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://medvor.ru/pbw?utm_term=what+is+the+moral+of+the+story+thank+you+ma%2527am PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd334651-cb2b-4330-a5e7-414e97812d3c/graco_x5_paint_sprayer_lowes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69bbbe86-e208-48f6-9086-7eca470b61e8/mixed_work_power_and_mechanical_advantage_problems_answers.pdfIn PDF document text
    • http://nuxawakaxaz.pbworks.com/f/xepamubomoxum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c7dc70d-6338-4847-b0ce-75cef1d7d963/34127948535.pdfIn PDF document text
    • http://jadubunid.pbworks.com/f/jnc_8_hypertension_treatment_guidelines.pdfIn PDF document text
    • http://poguvovuk.pbworks.com/w/file/fetch/144621420/xanilemaritezujeli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee14ac2b-9589-4b2f-a838-47f723a1bc77/23607250487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2867d733-dfac-4568-9c6e-b69039399c13/coleman_powermate_4000_watt_generator_specs.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/w/file/fetch/144555702/88498762130.pdfIn PDF document text
    • http://pimepovume.pbworks.com/w/file/fetch/144480192/logitech_k360_volume_buttons_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57d56c43-b121-4491-abf7-1523ec00c8c8/kenmore_pro_gas_cooktop_replacement_knobs.pdfIn PDF document text
    • http://gozuwef.pbworks.com/f/suduwopazawizipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c06675c-b9aa-445b-ba06-1320c1508051/what_order_should_i_do_fallout_4_dlc.pdfIn PDF document text
    • http://pakesobiroge.pbworks.com/w/file/fetch/144552960/12442539791.pdfIn PDF document text
    • http://jujupaw.pbworks.com/w/file/fetch/144536298/how_to_sync_hampton_bay_ceiling_fan_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c29a8a71-6383-46da-bb26-80e3d07265a6/quando_fazer_o_teste_de_gravidez_com_ovulao_tardia.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/apple_watch_series_5_44mm_cellular_price_in_canada.pdfIn PDF document text
    • http://xutosop.pbworks.com/f/grigori_grabovoi_number_codes_english.pdfIn PDF document text
    • http://jifesepapo.pbworks.com/w/file/fetch/144441378/163278473.pdfIn PDF document text
    • http://kufavuva.pbworks.com/w/file/fetch/144631812/license_key_for_easeus_data_recovery_wizard_11.9.0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bd2c0d6-588a-4afa-a9f1-c4d50e780ce8/is_amazon_becoming_too_big.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c73b746a-9687-41d3-9bb7-d841461f003b/where_is_the_thermal_fuse_on_a_kenmore_he2_dryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db9cddfd-8524-4ca1-909c-999e87a9310e/big_easy_turkey_frying_instructions.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_off0000dfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC5 5220 bytes
SHA-256: c44548f1d22580358f707fff62b9ec4bc0c899e730e5435d1f5dccf6412e6767
font_01_sfnt_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 10452 bytes
SHA-256: e61828d107fb9c94156af6b18fcaa9c49d9b4364f5cabc7d25fb36b1ae9b5edb