Malicious PDF — malware analysis report

Static analysis result for SHA-256 424629248905b30b…

MALICIOUS

PDF

93.1 KB Created: 2021-03-19 05:28:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0758e56e9b2cb9ac1a64152c1666c2be SHA-1: d4b465efe7425712d5b435516ae79412d6c78140 SHA-256: 424629248905b30b4a3a99ce41fc34d514d66be58ca7f12950b54bd12f47c73b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. It contains embedded URLs, with one prominent URL pointing to 'resalured.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to 'complaint and adjustment letter pdf', aligning with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/award?keyword=complaint+and+adjustment+letter+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421056/normal_5fc78ca973e30.pdfIn PDF document text
    • https://donabetolemi.weebly.com/uploads/1/3/1/6/131637402/tasumureviguw.pdfIn PDF document text
    • https://cdn.sqhk.co/vinogusi/cBDyhjI/knives_out_iowa_city.pdfIn PDF document text
    • http://smeh-mif.space/tax_to_gdp_ratio_india_2017-18lkjgq.pdfIn PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/397318bc8d31.pdfIn PDF document text
    • http://razvivatel.blog/dymo_labelwriter_4xl_labelling_machine_lw4xlvimg4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421615/normal_603ffb82ef45d.pdfIn PDF document text
    • http://tiktokfrance.fun/if_fx-12x3_what_is_the_value_of_f-3zr405.pdfIn PDF document text
    • https://pifonexivusefeg.weebly.com/uploads/1/3/1/0/131070190/6696733.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464052/normal_5ffa880897d93.pdfIn PDF document text
    • http://pidijajuwupurop.medianewsonline.com/jimimuduvivu.pdfIn PDF document text
    • https://cdn.sqhk.co/lopokevofoti/uibiaii/dodgers_time_out.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496374/normal_5ff4cef78898a.pdfIn PDF document text
    • http://itawegan.space/irobot_roomba_595_pet_series_batteryihqel.pdfIn PDF document text
    • http://gukabibus.mygamesonline.org/spoken_english_book_in_bangla.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/jdijjfH/no_man_s_sky_vr_requirements_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/ice7jKC/numiwunasorojukera.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gafodix.myartsonline.com/health_economics_review_journal_impact_factor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c981a825-ba3b-4919-8baf-e3a6314b63e2/waxexaxuverewekamazuxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2317166-9b91-4e44-9d24-e7933b14b647/girevewodemozovuvuniwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/266266f3-b346-41a1-b774-0a4a48df8da4/kurusivinanupuzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bd2e9ca-3dd8-4c86-a61e-1cae997eb47d/26517886596.pdfIn PDF document text
    • http://vekisofekibote.myartsonline.com/lisoxim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/352978ce-57f4-4024-9f9d-379b10fa8e9c/what_is_structure_in_healthcare.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_off00012c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3B 5168 bytes
SHA-256: cef9a63405d467f5a7d0b72cff0187320de4f11f7c9e89d995dce7c95690036f
font_01_sfnt_off00013db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB4 11664 bytes
SHA-256: 770eb2bcce9d7dc1125a18201b764c2f9b3cd3eb58e4967e5ec5c76358d72bf5