Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b583b929992317…

MALICIOUS

PDF

110.0 KB Created: 2021-04-08 04:39:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4ee9017fcad3cacd5a85f786df71ca21 SHA-1: bb76d19355e5a7b82bde3d94bf3e2f815bdd567c SHA-256: c7b583b929992317318749b9611d2f5030f5122eece9355f2689125ed5614356
192 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector infrastructure. The 'SE_INVOICE_LURE' heuristic suggests the document's content is designed to trick the user into clicking the malicious link, likely for phishing or malware delivery. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://yafferge.ru/123?utm_term=business+letter+template+example+word In PDF document text
    • http://dhl-order.info/zikonozogirupind6sug.pdfIn PDF document text
    • http://gapijet.scienceontheweb.net/82071749623.pdfIn PDF document text
    • http://kokolonesafu.getenjoyment.net/lolaxulopudoxiz.pdfIn PDF document text
    • http://wigoduxaru.22web.org/gidivafiruzozixub.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/97446870336.pdfIn PDF document text
    • http://paganel.world/overview_of_nigerian_economy8y68s.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
    • http://beninoduvewer.epizy.com/inverse_and_exponential_functions_answer_key_mvp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c706fc15-3214-4e94-965c-b9cbdcff3ccf/watalez.pdfIn PDF document text
    • http://wosozuwegarod.epizy.com/pubam.pdfIn PDF document text
    • http://gagolugumetuvo.epizy.com/gajariloxabitawekuwasuji.pdfIn PDF document text
    • http://gorefoverotiw.epizy.com/candy_shop_instrumental_song.pdfIn PDF document text
    • http://zadabodemuliju.epizy.com/alkaline_forming_fruits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/137ee85f-eec7-4bc1-94f9-a9f830dc0c1d/80048154039.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b752ecc-3874-46cc-9217-b5d4a6e763c5/cuanto_es_5.5_pies_en_pulgadas.pdfIn PDF document text
    • http://xumusemowujev.epizy.com/botines_con_plataforma_marypaz.pdfIn PDF document text
    • http://jemejuzot.epizy.com/2010_chrysler_town_and_country_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7586a204-5dd8-408e-89fc-950a2db1d29f/17197926691.pdfIn PDF document text
    • http://gedesopow.rf.gd/chhota_bheem_drawing_photos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/029b2219-8650-41e6-97e4-51f22838a199/dias_feriados_del_gobierno_de_pr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bff4ed9-4eff-4c48-8ccd-06580dd7f81a/82884355490.pdfIn PDF document text
    • http://fulariponazaget.epizy.com/hayward_power_flo_matrix_pump_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a815521e-28f2-450f-942f-2f1720ab0c0c/salary_of_chemical_lab_technician_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2d75af2-e6e6-4a09-8287-9ce1c05572e3/nazuxemawaribifukaketa.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_off0001621d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1621D 5196 bytes
SHA-256: 2f6a8b235b1bddaeff718d322ff6cf25ecd65c23ba13b2b31a5fb91e221fca6e
font_01_sfnt_off000173b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173B4 11924 bytes
SHA-256: ed61d9af5698ef22272dba04f2a9b53ef598bfd046386744b0172dc12fd62f01
font_02_sfnt_off00019c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C25 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176