Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d1f424f56d2a87…

MALICIOUS

PDF

83.4 KB Created: 2021-04-04 11:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a40cc9d9a679a89f15c123bb899f79cd SHA-1: 8882de672ad1b41ab08c6709c7b04269b4f67f2f SHA-256: 92d1f424f56d2a872a7ba6ce7ed9a3952434cd1ba0bece2eac9a5587a783aa3a
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 0.9993

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://gimoguvi.ru/123?utm_term=gibbs+reflective+cycle+template+pdf PDF link annotation
    • http://parhelifrl.space/factoring_trinomials_worksheet_a_1z7sku.pdfIn PDF document text
    • http://bluetea.space/sae_j1850_pwm5l83w.pdfIn PDF document text
    • https://nifudosuv.weebly.com/uploads/1/3/4/0/134040563/lepuwelerevipezasiw.pdfIn PDF document text
    • http://cesaregaspari.com/goladasedinatedizelidukifa39o.pdfIn PDF document text
    • http://desurobiv.22web.org/12494268211.pdfIn PDF document text
    • http://chempion.coffee/movegujizilizofe309x8.pdfIn PDF document text
    • https://vulemozebo.weebly.com/uploads/1/3/4/6/134693025/rulipofof.pdfIn PDF document text
    • http://kavevisukedawox.22web.org/xozukajukexizetije.pdfIn PDF document text
    • https://busonuvawariba.weebly.com/uploads/1/3/4/3/134355681/5c330.pdfIn PDF document text
    • https://kakowafalajoji.weebly.com/uploads/1/3/4/4/134455686/zimedudos-mivifuxunewif-xagukizupime.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gisunomadipoxas.epizy.com/peraf.pdfIn PDF document text
    • http://tagetebaj.rf.gd/add_admob_ad_in_android.pdfIn PDF document text
    • http://sedegagagojuwej.epizy.com/western_blot_technique_theory_and_trouble_shooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/131c4bc7-1935-48bd-983d-09336d2708e8/why_he_disappears_then_comes_back.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8002e40c-0e75-455d-9f76-4c6f7b572a1a/90110071723.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6666ab9a-9931-418d-b6e4-407d712883e4/36285889850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a5a28c-0563-4f14-85d3-ab1d6df3933e/vatizumuriruve.pdfIn PDF document text
    • http://wugadavax.epizy.com/asseverazione_di_conformit_della_copia_cartacea.pdfIn PDF document text
    • http://zogusise.epizy.com/la_iliada_de_q_trata.pdfIn PDF document text
    • http://fepezafo.rf.gd/tv_choice_guide_uk.pdfIn PDF document text
    • http://vuwadiwotaja.rf.gd/ceh_certified_ethical_hacker_practice_exams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dd70c86-63ce-4549-b636-10d0ca7f65c4/how_to_solve_for_missing_angles_in_a_circle.pdfIn PDF document text
    • http://keneledi.rf.gd/xekisanemezage.pdfIn PDF document text
    • http://petejubetitoma.rf.gd/hailea_chiller_hs-_28a_manual.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_off00010941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10941 5636 bytes
SHA-256: ed72328f228ea168b6d13f5ca49dc11eb0f115b5740b3cb1050661e4de3167dc
font_01_sfnt_off00011c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5A 10484 bytes
SHA-256: 8bd6f3ca959a9d1fc93069a443f50be5c7b8699375b4e4c987c560376353874a