Malicious PDF — malware analysis report

Static analysis result for SHA-256 544128f09de64daf…

MALICIOUS

PDF

86.6 KB Created: 2021-03-12 03:19:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2b24a6e735a31032a372100dec555508 SHA-1: 90840a0c853703fe2e17b0a54fface710bea31e3 SHA-256: 544128f09de64daf6de01dd48d0a17766efb45e5e206ae26c130eb14e0f76217
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 0.9990

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://soxebez.ru/strik?utm_term=how+to+solve+proportion+word+problems PDF link annotation
    • http://remazage.22web.org/65846016360.pdfIn PDF document text
    • http://pokezokebawi.mygamesonline.org/word_meaning_in_urdu_audacity.pdfIn PDF document text
    • http://hookup755.fun/monster_meaning_in_urduulir4.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/2454893135.pdfIn PDF document text
    • http://fibutogu.mywebcommunity.org/strangers_on_a_train_book_themes.pdfIn PDF document text
    • http://fejugutafilevin.scienceontheweb.net/53971630575.pdfIn PDF document text
    • http://vizionsmc.net/tilazajobofelutadizewuyscmb.pdfIn PDF document text
    • http://verenica.net/57724359494ldbiy.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/26632091166tfbtg.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/american_literature_association_2019_program.pdfIn PDF document text
    • http://farozemirig.scienceontheweb.net/70158591217.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sutexuvidag.myartsonline.com/77265158941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1901af4a-983b-4238-ada9-9b697714d6e1/2013_hyundai_sonata_bumper_replacement_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbb065fa-f330-4334-abda-75e30571695d/what_does_real_gdp_not_measure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/550ad401-2441-479c-8959-21230007c61a/scat_bus_route_6_sunday_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/643e704b-05ca-42a6-930c-98084778846c/attack_on_titan_wallpaper_levi_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9e60f23-e835-4629-a4a7-9343978935f6/zosuxipofenagorow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59ff4b8b-ae46-4db3-ae67-9dd30aa8db00/paxuvixopawamumosimazov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b584377-68db-4d23-a9b7-05c07984ffd1/kewepunirowaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20bcd41b-70d6-4e0c-957f-5fd1a74c3468/fluent_python_free_download.pdfIn PDF document text
    • http://kekusilubuf.epizy.com/probation_period_confirmation_letter_template.pdfIn PDF document text
    • http://duwufinojitu.rf.gd/tixemisowomekik.pdfIn PDF document text
    • http://wolobugoxew.myartsonline.com/how_to_find_the_common_ratio_of_a_geometric_sequence_fractions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3e7b9fc-d1c2-49c5-856f-fc07d4f4aef2/how_to_tell_if_sump_pump_is_going_bad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43a74c0d-8f3c-4215-9892-b23c84712261/dometic_rv_air_conditioner_fan_not_running.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 5148 bytes
SHA-256: 2cac21b6979a730a5cc0bc7f9d6f328c91d57aeaa76bfee6c8373176f9d6cd79
font_01_sfnt_off0001115e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115E 10856 bytes
SHA-256: f03f6fee5c7f1923453abc87982b9da0b0c99133bad01b0d835bdec86e74f1a1
font_02_sfnt_off000136c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C6 16256 bytes
SHA-256: 96ddeee9a376626c84f95cea7498c6461267c28b46533401e61a9356c6573d84