Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7967a6caf0f9593…

MALICIOUS

PDF

98.1 KB Created: 2021-03-16 07:32:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c84c4e090b62578f278fa77fc5ac15ad SHA-1: 51dde71fb159be2c6f4dddf4545ea67f2239b613 SHA-256: d7967a6caf0f95932a4d1a2404e12520140660c08732aebed611ccb941f830fb
66 Risk Score

Malware Insights

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

The ML classifier and PDF heuristics strongly indicate malicious intent. The document contains numerous embedded URLs, with one pointing to 'baarspo.ru', suggesting it's part of a link farm designed to redirect users to malicious content. The presence of multiple disposable hosting links further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 4

  • 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://baarspo.ru/123?utm_term=restaurant+ramen+nutrition+information PDF link annotation
    • http://bioforce-co.site/43002907255m0b1l.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/cXjhehf/15127605192.pdfIn PDF document text
    • http://inglassrus.ru/modelos_de_inventarios_probabilisticos_investigacion_de_operacionesxdnmn.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/gFchdid/75976352559.pdfIn PDF document text
    • http://wesabelilunu.22web.org/54913981016.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/lowiwomenusovelfnwu4.pdfIn PDF document text
    • http://lefejot.22web.org/common_saint_names.pdfIn PDF document text
    • http://leyloften.online/how_to_do_fractions_on_a_casio_fx_260_solar_calculatorl5n0u.pdfIn PDF document text
    • http://rapalafipotofuw.iblogger.org/reses.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzifixe/jjhhdih/84702167933.pdfIn PDF document text
    • http://damita.fun/nubozoxpb42p.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/tafogusegabomu/derivatives_market_in_india_project_report.pdfIn PDF document text
    • http://wadabegamubezo.epizy.com/60483591564.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/ppt_templates_free_timeline.pdfIn PDF document text
    • http://logurerot.rf.gd/boy_scouts_christmas_trees_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a3809f9-1378-4a4f-96a9-d6e187cd511f/minn_kota_ulterra_saltwater_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37d6869c-01f3-4eee-8971-a56f1e3fcfdd/6762241924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed77afd9-1f70-4524-bc9c-c797d326cac8/99495973221.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/manonadusafiguku.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/lomidavewagawa.pdfIn PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_0f09a9ec933949bc8115bd84e4173b1e.pdf?index=trueIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_74a351af235c4d7980fd7a6e0f2c3394.pdf?index=trueIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_114d1fc7e6fe453fa4c3e058bd6f29f3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b4c255-1bd3-4292-a992-3ef42f6188b8/punctuation_exercises_for_grade_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebb6d961-2472-4c9f-9dfb-bfcb3f1c02ef/how_to_fix_dishwasher_noise.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_off000137a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A1 2880 bytes
SHA-256: 5f03d2c6bc08d28d18892b3fd5153044a2fff6aad81dd629dfd07635bf6cf50e
font_01_sfnt_off000141de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DE 4888 bytes
SHA-256: f8e940fa22fbf3c81673794b57cf594a373cefaf2c3bbfa952b7130e50d3f167
font_02_sfnt_off0001526a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1526A 11556 bytes
SHA-256: cbd25cfc50187d493c17dd72418674d6911bb9aecf0f1d0882d1b706c3013007