Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2241f594d1462f…

MALICIOUS

PDF

84.6 KB Created: 2021-03-23 16:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 38270c4c1d61768682bb06c9f3207742 SHA-1: a82da3b09fda42883b0675168943a158a2f15277 SHA-256: ca2241f594d1462f3c43dea3ee37d46eaafd0b313339855d232fff7707161d10
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-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://fokemale.ru/123?utm_term=diploma+civil+engineering+project+reports PDF link annotation
    • http://lnstagram-badge-verification.com/internal_carotid_stenosis_treatment_guidelineseyjhd.pdfIn PDF document text
    • http://randname.ru/beer_mechanics_of_materials_8th_edition_solutionse61am.pdfIn PDF document text
    • http://santaparker.store/install_instructions_for_ring_doorbellojrbc.pdfIn PDF document text
    • http://dk-inc.xyz/21868367482ddyg7.pdfIn PDF document text
    • http://update-win20.online/orbit_sprinkler_timer_wont_shut_offg3jxt.pdfIn PDF document text
    • http://0fruits.space/capital_market_line_is_firstly_initiated_by9y1vf.pdfIn PDF document text
    • http://lazadacostumercenter.com/14951647968kxirn.pdfIn PDF document text
    • http://itverys.space/shiv_tandav_stotram_lyrics_and_meaning_in_englishgp9w7.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/8488749087953eg1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a6f22b7-9b6e-4942-bb03-66fb42bdcce6/best_4_person_hot_tub_for_the_money.pdfIn PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_cddecd9ca51b47958d55026153ed6890.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c55974f0-5b96-407d-a6d9-27e2249c9918/samsung_nx3000_vs_nx300.pdfIn PDF document text
    • https://107a3552-ed21-4f5d-95e3-510b6eae4444.filesusr.com/ugd/21bbef_c4c081eb652d4f5daedb37ecad86a0ec.pdf?index=trueIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_697f9e66f1654799a7e058426c7f4f34.pdf?index=trueIn PDF document text
    • http://sonogobujajeva.rf.gd/sipavi.pdfIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_e683849f2a784f74907e01ee9c3513d6.pdf?index=trueIn PDF document text
    • http://xowitulodif.rf.gd/sepher_raziel_hamalakh.pdfIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_014e6fad4ca94392b9654735d4275400.pdf?index=trueIn PDF document text
    • http://vizepojuduw.rf.gd/phd_guide_list_in_anna_university_chennai.pdfIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_52c2d7008efb4b48b0d9a3c6b99e5c60.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/351a8637-d837-432c-b7ec-35792124c1f8/what_is_the_subset_of_3_4.pdfIn PDF document text
    • https://40fd9d30-e691-4ad4-9ff9-7de67b304886.filesusr.com/ugd/45b27a_59452989eb454ee7b824f6f11c1948ca.pdf?index=trueIn 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_off00010c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C07 5388 bytes
SHA-256: 1139d0b1b12b4827db860bf718f34382e0c92d87beff7cf5fb0cea17bcadbe6e
font_01_sfnt_off00011e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E53 11272 bytes
SHA-256: 11af0672a350371e772665699ab1f27853d69d62eac7fb49dbca497ad8dc0d1c