Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa8c7345b52c60f…

MALICIOUS

PDF

86.9 KB Created: 2021-03-30 00:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 588e86d8fbc94c6cc6b9a806d190954c SHA-1: 3d1966aced2ab7a4e6ea442fdd8ba2bd06e047f6 SHA-256: 1fa8c7345b52c60f2382ecab4359441d17e01c73d013d1c525b335292549ff59
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=medieval+hood+pattern+sewing PDF link annotation
    • http://lubevos.scienceontheweb.net/gukuxovewopumalelakowudu.pdfIn PDF document text
    • https://cdn.sqhk.co/sozimelizak/hjbfgjs/nudubusapolevibawobijawul.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/surface_area_of_square_pyramid_worksheet.pdfIn PDF document text
    • http://novazeku.mygamesonline.org/cantigas_de_escarnio_e_maldizer.pdfIn PDF document text
    • http://ketenimolupev.sportsontheweb.net/64478349407.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/xniehf9/jjo_sonic_boom_2015_lineup.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/c5jajeR/1578003312.pdfIn PDF document text
    • https://cdn.sqhk.co/talexadu/3Dhchfi/zarejusowanejifota.pdfIn PDF document text
    • https://cdn.sqhk.co/tijatabov/jja6VNv/kelton_nursery_ofsted_report.pdfIn PDF document text
    • https://nizufamira.weebly.com/uploads/1/3/4/3/134310662/tigib.pdfIn PDF document text
    • https://cdn.sqhk.co/rasetiwulipu/hg4m98Z/49567946625.pdfIn PDF document text
    • https://cdn.sqhk.co/latipizi/NggC1Wd/56319575119.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/ehijdF8/over_g_modern_air_combat_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jevikepuja/jaEfgdI/all_cinemark_theaters_near_me_showtimes.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/why_is_nonviolent_civil_disobedience_effective.pdfIn PDF document text
    • https://bopamoverera.weebly.com/uploads/1/3/1/4/131408256/2974058.pdfIn PDF document text
    • https://sogazefod.weebly.com/uploads/1/3/4/0/134000298/sekiret.pdfIn PDF document text
    • https://cdn.sqhk.co/kebokeregim/icjiv80/78319604842.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/hlhgeD8/kotogizojibepom.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://uploads.strikinglycdn.com/files/572aab8b-6f36-4b1e-bb37-b171f6fd1abb/summer_waves_14ft_elite_frame_pool_with_filter_pump_cover_and_ladder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e52eba-f5cc-4cc1-812c-b7e5a54beda8/letanamaneniributofujibam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfdad5dc-101b-4753-bc4d-33caa263b41c/carol_duncan_art_museums_and_the_ritual_of_citizenship.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e2bc105-6ff2-4f93-874b-7e05ca36181f/95494182662.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 5168 bytes
SHA-256: eaeb47074a6cde6c85888cb9718633d7fc36b9251657d188fed0a8e9156c8577
font_01_sfnt_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 10556 bytes
SHA-256: 39010c14edd588d76d77c843273c903dbdf762a17da63f6aafa7d0322ebd8d02
font_02_sfnt_off00013fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEC 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3