Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5dee601e967e56a…

MALICIOUS

PDF

80.9 KB Created: 2021-04-01 06:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 55b818837546d852fd4dae99f90e3ef8 SHA-1: 91544df0b6338f85a1458d7e405d427ed8f08cae SHA-256: f5dee601e967e56a2b7e4b99e2a1d91a31e028362d65916e3e828b37532c6170
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 0.9997

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://xezojetit.ru/123?utm_term=blank+cornell+notes+template+printable PDF link annotation
    • https://cdn.sqhk.co/zoxunoromi/pjbjh82/grey_worldwide_sea_sdn_bhd.pdfIn PDF document text
    • https://rujibuteza.weebly.com/uploads/1/3/5/3/135308743/87e94a6ad.pdfIn PDF document text
    • https://lapadodipelij.weebly.com/uploads/1/3/1/1/131164402/nanulokilefot.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/eXuhOkp/lone_survivor_netflix.pdfIn PDF document text
    • https://cdn.sqhk.co/bujiwamovul/jeiLhht/sixajolafinale.pdfIn PDF document text
    • https://jevizaja.weebly.com/uploads/1/3/4/8/134869407/xobokazagazu-zitamisavam.pdfIn PDF document text
    • https://cdn.sqhk.co/segenapiza/efaigig/consultar_mi_factura_at_t.pdfIn PDF document text
    • https://cdn.sqhk.co/sarowojep/OVjazha/hangman_2015_movie_explained.pdfIn PDF document text
    • https://vajilitoseg.weebly.com/uploads/1/3/1/4/131437648/jusewafejivewasuw.pdfIn PDF document text
    • https://cdn.sqhk.co/manizamo/geHphdV/mavegipilex.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/sjd57hc/the_signs_carolyne_faulkner_free.pdfIn PDF document text
    • https://cdn.sqhk.co/tedubifo/igjixge/new_offroad_army_bus_driving_simulator_2020_maniac.pdfIn PDF document text
    • http://mamunetosi.iblogger.org/90689009490.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/bepukuba/sovovodujosejixodafibite.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/80935826364.pdfIn PDF document text
    • http://velewetuwo.rf.gd/87295441442.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/emory_emergency_medicine_residency_salary.pdfIn PDF document text
    • http://ratamam.epizy.com/ap_seminar_iwa_rubric_with_scoring_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/live_net_tv_4._6_apkpure.pdfIn PDF document text
    • http://zexaxoneda.epizy.com/how_to_reset_a_kindle_fire_5th_generation.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_off0000f1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 5120 bytes
SHA-256: 91f0444f1ec09b9e9338a613d3e26e86c4319b66dceb3ed3de882a3be2b2ebf6
font_01_sfnt_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 10848 bytes
SHA-256: 92e11d47a400e2caecd85e5d96cb34e4d6dc155b0aaa4298c7cd64af8ec9b68c
font_02_sfnt_off00012802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12802 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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