Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c0f2f26747f8f3…

MALICIOUS

PDF

79.0 KB Created: 2021-06-09 01:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 36d82090fe94abb09ab62199a25aa678 SHA-1: bbae18040d264d84c982eb729037b0b30417f19e SHA-256: b3c0f2f26747f8f3ebdabafa19a4334cfac4669f0538ec42f3eb54bd915d51ea
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://drafthe.ru/pbw?utm_term=bloons+td+6+mobile+free PDF link annotation
    • https://gijifapezikad.weebly.com/uploads/1/3/4/6/134644128/nejudidif-zomoxe-tepibite-rabikisagikefab.pdfIn PDF document text
    • https://nobenegutebofem.weebly.com/uploads/1/3/4/6/134615432/ca6a28.pdfIn PDF document text
    • https://liwojugimigazip.weebly.com/uploads/1/3/4/9/134904469/zofavix.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://lopasexosew.pbworks.com/f/piano_scales_free__50____Low__5.pdfIn PDF document text
    • http://fajopab.pbworks.com/f/20181795201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5cdd9ef-eff3-4ab5-960e-e886bc2ecf7e/xirabunakekepikuwudofil.pdfIn PDF document text
    • http://finebov.pbworks.com/f/how_do_i_view_page_breaks_in_wordpad.pdfIn PDF document text
    • http://keborekudud.pbworks.com/w/file/fetch/144686703/fenabiz.pdfIn PDF document text
    • http://pimepovume.pbworks.com/f/42825448689.pdfIn PDF document text
    • http://lewiwebula.pbworks.com/f/allen_test_series_for_neet_2018_download.pdfIn PDF document text
    • http://vejivab.pbworks.com/f/didugifonisojij.pdfIn PDF document text
    • http://kedajawi.pbworks.com/w/file/fetch/144740436/examen_de_ortografia_para_tercer_grado_de_primaria.pdfIn PDF document text
    • http://runaliguredu.pbworks.com/w/file/fetch/144874047/87482883489.pdfIn PDF document text
    • http://negaboxa.pbworks.com/f/lego_star_wars_the_complete_saga_codes_wii_yoda_ghost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41df9028-7225-4216-b5b2-52ecb19cff9b/5616518727.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d25852f-398f-4569-bf56-126a62408a9a/are_auto_repair_shops_open_on_sunday.pdfIn PDF document text
    • http://xifatarege.pbworks.com/f/soduzexik.pdfIn PDF document text
    • http://jowenoxo.pbworks.com/f/how_do_i_change_my_airprint_printer_name.pdfIn PDF document text
    • http://beratirupo.pbworks.com/w/file/fetch/144697392/keto_diet_food_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cb34e2f-c759-42d4-860e-be7710cba60e/70202680801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb5c2ca2-6b60-4e26-9203-6d71b4d62cd2/why_ieps_are_bad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48a92c8e-4813-45cc-b385-867f0e73b6b4/how_to_connect_hype_bluetooth_speaker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/546f9f58-96a5-45cd-9736-9653fff245e3/tales_of_a_fourth_grade_nothing_chapter_1.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_off0000eb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1F 4976 bytes
SHA-256: 39fba7ded0b9f329c5faee18947499271818603799121acf6478f370f7564e80
font_01_sfnt_off0000fbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE7 10744 bytes
SHA-256: a6f58fa14e51401b4c35b2e0899c783660a123e1f4c20441025dd473622c8003
font_02_sfnt_off000120c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e