Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1bfec55b2f5772…

MALICIOUS

PDF

174.6 KB Created: 2021-03-20 03:13:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 59d98139309f28e155652eab15e4f947 SHA-1: 3b9e45748b6f631f0cea7445fd2fc8096be844c4 SHA-256: db1bfec55b2f57723702cd760b86a298274c8cc25f98692a498978830c6a4cf4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9988

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://maypoin.ru/award?keyword=career+paths+electrician+express+publishing+pdf PDF link annotation
    • http://bluebadge-support.com/android_biometric_prompt_support8e4rk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385869/normal_604179ee63911.pdfIn PDF document text
    • http://instahelpforbusiness.com/904971420586hhta.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/case_files_neurology_3rd_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409420/normal_6014bd25cd02b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476601/normal_5fdc6f4f6efdc.pdfIn PDF document text
    • http://revershjtb.site/is_upright_bike_a_good_workoutkhfax.pdfIn PDF document text
    • http://persequen.com/author_s_purpose_worksheet_3rd_grade_free9zwmh.pdfIn PDF document text
    • http://hookup153.space/chick_fil_a_starting_wage_ncintm0.pdfIn PDF document text
    • http://gikodarekegov.mywebcommunity.org/83310304904.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/wajibile/58283575058.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd29a69a-ef93-4306-a025-063283bb7c13/dell_latitude_e6410_broadcom_ush_driver_windows_10_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/87303251744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22be67f5-3ae4-42d4-8bf4-e5396204b2eb/how_to_find_the_slope_of_two_points_without_a_graph.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53ed83b1-1b08-45d0-99bd-cf2aca7cb8c7/77604960346.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/47246250893.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/desarrolla_una_mente_prodigiosa_ramon_campayo_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2218ea68-4ea3-486f-8188-e58229f2be40/vuwozowupavabisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ec70acd-bbaf-49cc-b243-f10f5ce59adf/rimatazulorirokosirug.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4E 110932 bytes
SHA-256: 128d5e4f6ab581c81ad750ee9c2c9fee91a202ac4a5dd730ea5ba949cfb6c55c
font_01_sfnt_off000263f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x263F7 5420 bytes
SHA-256: 8bd82a8c6fcaefb46734d0a6effd90b80f9ef1b22d2f44c30887115112b47cec
font_02_sfnt_off00027659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27659 11800 bytes
SHA-256: 52b5e25c8bb214da01b86fce351743f7fa14c7bf9931a2130f680dbe5631d0f6
font_03_sfnt_off00029ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29DDB 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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