Malicious PDF — malware analysis report

Static analysis result for SHA-256 359d36e287d3fcdf…

MALICIOUS

PDF

75.2 KB Created: 2021-05-08 03:40:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 15b656c2d4d987d7547b71a7139907ac SHA-1: 777a1b64f7fad98850eee30ad16f918986becb7b SHA-256: 359d36e287d3fcdf87427daf4be3d6f51516088e1d0a13a0e6b1e263dcb5a797
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • 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://jottigo.ru/strik?utm_term=actividades+matematicas+primer+grado+secundaria PDF link annotation
    • https://niwitibu.weebly.com/uploads/1/3/1/6/131636677/ddd9a11.pdfIn PDF document text
    • https://girowotejetut.weebly.com/uploads/1/3/1/4/131406843/7831865.pdfIn PDF document text
    • https://lesivemiseleji.weebly.com/uploads/1/3/1/3/131381961/8104162.pdfIn PDF document text
    • https://fomunova.weebly.com/uploads/1/3/4/6/134684458/zotedijesupo.pdfIn PDF document text
    • https://xowilululevala.weebly.com/uploads/1/3/4/0/134017879/vusoditemo-sefatop-pekoxij.pdfIn PDF document text
    • https://fusufuxono.weebly.com/uploads/1/3/1/6/131606103/6033504.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/pilazi/el_libro_meditaciones_de_marco_aurelio.pdfIn PDF document text
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_776238d1c6934b3392b5cfff5fa5c4b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a143e240-395f-4b71-a8e7-e1031943c6a2/zixotilitejevoxefeviro.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/polar_form_of_complex_numbers.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/35247228237.pdfIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_b05b750092cd436a8fa653a31a7ff384.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccf95e84-9c10-4404-9761-eebd7055126f/how_much_does_a_covid_test_cost_in_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/84301358744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f77a2f98-bffa-4239-adb7-e4c7ff7b16e8/emule_kad_server_list_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/20384066647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60f85f5d-c61a-4f07-bff3-428d7c37e5af/how_to_file_usps_international_insurance_claim.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/my_talking_angela_mod_apk_android_1.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/ielts_listening_and_reading_answer_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/2091882124.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/what_is_the_meaning_of_canon_law.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/english_language_arts_book.pdfIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_24d5c34c3b6146ac9cf681959c9f47e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7b6caa8-82ea-441e-ae51-8f2b61e6b5ba/83520911992.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_off0000e438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE438 5408 bytes
SHA-256: 829c69ab3e9209aa4418c8af7fcfc85716a0d7979f36b480bffe5e1af74f73c5
font_01_sfnt_off0000f68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68F 11972 bytes
SHA-256: 0b2b60605379e84c66dfe8ef94b9310fad64537b7078baab846cddd85b9da2d6

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