Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5554a8e05d2f44a…

MALICIOUS

PDF

159.5 KB Created: 2021-04-15 01:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fd2fc56d6974afc668ca9432a81c744c SHA-1: 1b173c2e35fe018ab14d53c315099e56a1ce281e SHA-256: a5554a8e05d2f44a22394c64c530552a42980395bd315a58e11350803d3a50ec
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 0.9995

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://bologen.ru/strik?utm_term=don+juan+sparknotes+moliere PDF link annotation
    • https://lotijilakoda.weebly.com/uploads/1/3/4/4/134468432/837543.pdfIn PDF document text
    • http://bomisedoxu.mywebcommunity.org/children_s_apperception_test_cat.pdfIn PDF document text
    • https://cdn.sqhk.co/felibepudu/heqihia/sababudixubepatazo.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/CgifXHS/wolepa.pdfIn PDF document text
    • https://cdn.sqhk.co/tijanukubo/jfQjigh/bejanimuwukureliga.pdfIn PDF document text
    • http://fuwiduwoxobol.mygamesonline.org/67391666657.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/metro-north_railroad_bronx_ny.pdfIn PDF document text
    • https://cdn.sqhk.co/zupivikeg/fE0jgCC/monster_hunter_generations_ultimate_guide.pdfIn PDF document text
    • http://weridif.medianewsonline.com/lexique_assurance_vie.pdfIn PDF document text
    • https://zomerasojukoluw.weebly.com/uploads/1/3/4/7/134769652/gadadize.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/nR2gfjd/zombie_city_survival_mod_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kelovikaxovixu.epizy.com/fiwixekitidepodimokejojik.pdfIn PDF document text
    • https://d6921c5e-ad40-47a8-8d28-605c6bd4eeef.filesusr.com/ugd/3306a4_406c5f8a6ccc40308d50f5dca18a6f03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce2aa7d6-0212-4a94-beac-7cffd861caf4/rules_cynthia_lord_characters.pdfIn PDF document text
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_9ae0b239e19e46e697234c55689409b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6954dc6b-282d-4551-80cc-e3bcbbedbd2c/what_is_supplement_theorem.pdfIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_5058f0a34336474b88a372c6ea248310.pdf?index=trueIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_d87a4e17bbd241b885953441830d628b.pdf?index=trueIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_3e3b8f8021a44db980cfb0eb2d44ac6b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e14cef2-4849-4333-addf-1a7cd6e0f03f/ubd-k8500_dolby_vision.pdfIn PDF document text
    • http://gabixemi.epizy.com/kenmore_he3_washer_error_code_f_dl.pdfIn PDF document text
    • http://wifofevowogak.onlinewebshop.net/introduction_to_geometrical_and_physical_optics_joseph_morgan.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_off0002386f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2386F 5104 bytes
SHA-256: c87dc05d14e88cb12cd50e664f69454ffdea941c0673e87e35dbfb9d1bc87b5b
font_01_sfnt_off000249c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x249C3 11912 bytes
SHA-256: e430fc83442079fb8d3a587c5fc04b584d4041203bc31fab023ff8a7641b7416