Malicious PDF — malware analysis report

Static analysis result for SHA-256 9737a7d16b55ea2e…

MALICIOUS

PDF

78.2 KB Created: 2021-03-28 05:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1deafe2a1077674a70e3380a14972644 SHA-1: 967567ad984b87238253127ce0d2294628b08f30 SHA-256: 9737a7d16b55ea2e77c4d700df96ca2e1ab2d4b3aacf1e788b1af91932fcdba1
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 0.9991

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://mezovuduw.ru/123?utm_term=akira+full+movie++hd PDF link annotation
    • http://agencymedia-ig.com/diseo_y_analisis_de_experimentos_montgomery_octava_edicionllubx.pdfIn PDF document text
    • http://spiritstudio.ru/4_purposes_of_police_report_writing120n6.pdfIn PDF document text
    • http://santecmb-sarl.com/xofagetki2y.pdfIn PDF document text
    • http://trening-ekaterinodar.ru/13_derivatives_of_inverse_functions_homework_answersjt1ze.pdfIn PDF document text
    • http://usmileofficial.site/playstation_gold_headset_pc_setupnng43.pdfIn PDF document text
    • http://copyrights-notices-helps.com/97481324939lpq1c.pdfIn PDF document text
    • http://indohealth365.online/birthday_cake_images_for_boy_babysx91e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dusined/7089498321.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5536f625-1065-4d34-a643-c810085b39c6/1770469005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6cf840f-75fc-4cf3-8e9d-5acf73e33b76/why_were_pennies_changed_in_1982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3323c1dd-80ca-43e1-90c3-80dd66f08a0e/12283886826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c84e2d34-e83b-4d45-891d-6db16a984c92/92229397708.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/how_to_use_netgear_powerline_1200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf6469f-3c4c-47e9-9b84-8781c8558182/33413190128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/691511e8-f71b-4d21-aa2f-62d3c44b501a/how_do_i_get_my_hp_deskjet_2600_to_scan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14dcff90-914a-4987-8689-5915bc691936/preguntas_y_respuestas_del_capitulo_3_del_caballero_dela_armadura_oxidada.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/elchronicle_character_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/donab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/453b8b90-5420-42b9-b1c8-171dc685e2fd/economics_lesson_plans_high_school_supply_and_demand.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/how_to_turn_off_ihome_bluetooth_keyboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e938f37a-a913-4247-b179-508fc41be706/77509115819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b0ed124-d71b-40ab-9b73-8265dd58532b/365_drawing_prompts.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD352 4780 bytes
SHA-256: a3415f98772264baa4bff4409549fb2e6199992ecbe83c916c5d2bbda3553f1f
font_01_sfnt_off0000e38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38E 10712 bytes
SHA-256: b3980137a9153b13fbc467605cf510aab66fa3772e23edc9a5c16a817eb724b0
font_02_sfnt_off000107fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FD 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1
font_03_sfnt_off00011d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D15 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71