Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c5df0531a14071…

MALICIOUS

PDF

79.5 KB Created: 2021-03-29 17:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e91ff086e166ad0bd0d089d1c55e8d76 SHA-1: 1457c415fba990230f12c7d8eb0b3b467eff9dde SHA-256: f1c5df0531a14071a6282b17bba93c518f61e42286523cd7fd969298c321542f
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external links, with one prominent URL pointing to a link farm on disposable hosting, suggesting a phishing or scam operation. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs are indicative of malicious activity, likely aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/123?utm_term=attack+on+titan+episodes+guide+and+summaries PDF link annotation
    • https://budozawepolok.weebly.com/uploads/1/3/4/8/134852557/gijolale_kexexedufoz_zanifuma_dutepebol.pdfIn PDF document text
    • http://yourlivehelp.com/pdf_english_test_for_beginnersq4w0t.pdfIn PDF document text
    • http://sendgrid-de.com/55979313786yp68r.pdfIn PDF document text
    • https://xonutadeb.weebly.com/uploads/1/3/0/7/130775355/wezazepibedapa_kigujugazuroz.pdfIn PDF document text
    • http://gratoramaa.website/canadian_citizen_application_formppx8u.pdfIn PDF document text
    • https://bebefezagogu.weebly.com/uploads/1/3/4/3/134372182/lovupa.pdfIn PDF document text
    • https://siwepuxerit.weebly.com/uploads/1/3/0/7/130775843/kebefumutek_xorol.pdfIn PDF document text
    • https://wijuzibodeba.weebly.com/uploads/1/3/0/7/130738798/fuxekegurodoni_fukafulot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/imovie_project_templates.pdfIn PDF document text
    • http://wojobawezelo.rf.gd/student_attendance_sheet_in_excel.pdfIn PDF document text
    • http://lezipador.epizy.com/idsa_pneumonia_guidelines_2018.pdfIn PDF document text
    • http://lupunajanap.epizy.com/how_to_add_files_into_garageband.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/96127782595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92fd50eb-095a-41ae-96bf-aebb2dcc2173/54231431890.pdfIn PDF document text
    • http://womififirijafe.rf.gd/59218471055.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/favovoni.pdfIn PDF document text
    • http://gulejarapexovut.epizy.com/milusopivudewakiraxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bbbf3f6-1bbb-402d-97fb-38021d035b0f/christopher_hitchens_quotes_on_writing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bd2e9ca-3dd8-4c86-a61e-1cae997eb47d/26517886596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76e11218-f44d-4169-9cc8-99efe6aabd3e/throne_of_glass_complete_series_hardcover.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/unfamiliar_words_using_context_clues_worksheets.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_off0000ee39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE39 3576 bytes
SHA-256: e1cae919d853a5930142f75075a4b545c18cf43bee328e2afbf5e32350ade631
font_01_sfnt_off0000faf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF4 5412 bytes
SHA-256: 34a8e2f4ec445d3520104d5c167ac3ec7200b724cc1e22e7fd03ce3e61f3a780
font_02_sfnt_off00010d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4B 10248 bytes
SHA-256: 5502b2b1aeca026e091386eabfc8405f1e55c330809b74abc44a9b027fe78530