Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdcfeb1c4da52700…

MALICIOUS

PDF

87.1 KB Created: 2021-03-20 18:33:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 56b2204a4fa67fd2eb35a67bc42b3fb5 SHA-1: 128e69c1d37dbd62787b5dd02930e68cd8129e8a SHA-256: fdcfeb1c4da5270091af9049ef22a8040acd03fa6ab3e2160c8ab3411a54962f
186 Risk Score

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=anastasio+aquino+biografia+pdf PDF link annotation
    • https://pavejomesof.weebly.com/uploads/1/3/4/3/134310872/merixawurusa_wuwabimo.pdfIn PDF document text
    • https://cdn.sqhk.co/gepatunasux/gKhgb56/vixiravij.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/jKVigja/17119295183.pdfIn PDF document text
    • https://fanawilixu.weebly.com/uploads/1/3/1/4/131408209/4cefc04f.pdfIn PDF document text
    • http://sparzha.club/play_among_us_online_free_pcn3thg.pdfIn PDF document text
    • http://instapriz365.online/axial_scx10_ii_cherokee_kit_review7lrij.pdfIn PDF document text
    • https://nigerizebamogut.weebly.com/uploads/1/3/4/5/134596745/zolap_sajemekaxoneja_dotoradadidoni.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/FjDNhcK/american_civil_war_free_states.pdfIn PDF document text
    • https://dinuboxisoxim.weebly.com/uploads/1/3/1/8/131857966/dadugawop-xumapogabuwil.pdfIn PDF document text
    • http://changepass.online/moksha_en_el_hinduismoxccjv.pdfIn PDF document text
    • https://cdn.sqhk.co/vilomikov/YOn6Swc/25260088819.pdfIn PDF document text
    • http://m-laskin.ru/95377874962o5w7u.pdfIn PDF document text
    • http://lawexape.mygamesonline.org/tuxufenazepugodubivuw.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/urmgiii/91221828578.pdfIn PDF document text
    • https://puwukozo.weebly.com/uploads/1/3/4/5/134587621/benivuk.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/VgjjaFM/65664804079.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/7b022510-8d3c-48e1-9798-f4cbb2c3e2ed/biblia_reina_valera_1960_con_nmeros_strong_en_espaol_gratis.pdfIn PDF document text
    • http://xabudavadeguvo.myartsonline.com/autotask_api_documentation.pdfIn PDF document text
    • http://wavexijazibivat.myartsonline.com/tewopowatofevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54d2f2ff-eb13-42a0-8fe7-2273b6c761ed/9415945076.pdfIn PDF document text
    • http://sabixukavizom.myartsonline.com/how_to_get_surface_area_of_a_trapezoidal_prism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baf15e97-96b5-4266-83f6-be04a7cbb1df/wuzadoxuroxegejav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5693fd52-a5e9-4ccf-9a27-ab168f130203/tizolawa.pdfIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/reliable_change_index_calculator_excel.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_off000115e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E6 5432 bytes
SHA-256: f16ec9c38f5a3645a4478457bab00464357333be50009436462ea4a8d35f771a
font_01_sfnt_off0001285e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285E 11752 bytes
SHA-256: a24429469be3e83d8b6132194127a46c20aff7abbae49bd93e28219e454790cb