Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f55072ef4d3003…

MALICIOUS

PDF

75.5 KB Created: 2021-04-01 00:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: eeb85d2882b8330a8fcd045310518f18 SHA-1: 94bd306266b1a4bcfd3bbcf2a9bac14c38c21d06 SHA-256: 28f55072ef4d3003087bfd997ecd3736d143f29c240f409ab8e883c3e1eba654
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crophysi.ru/award?keyword=iowa+state+map+pdf PDF link annotation
    • http://cheapestshop.xyz/transformational_leadership_styles_in_nursingx8xdo.pdfIn PDF document text
    • http://pevewoxoxup.scienceontheweb.net/zifolozikurojoluxifikava.pdfIn PDF document text
    • http://seamanygau.best/how_to_set_time_on_skyscan_atomic_clock_model_86715a12dh.pdfIn PDF document text
    • http://kalukoroduro.mygamesonline.org/gujizilitajevorutudube.pdfIn PDF document text
    • http://pakupuxojopef.getenjoyment.net/fiwumibub.pdfIn PDF document text
    • https://cdn.sqhk.co/vabusowubada/iqiaieV/microsoft_excel_break_even_analysis_template.pdfIn PDF document text
    • http://ludshop.xyz/mipaninolukuvisotb6qbm.pdfIn PDF document text
    • https://cdn.sqhk.co/weruvewo/gh9Qge5/global_information_technology_report_wef.pdfIn PDF document text
    • https://cdn.sqhk.co/genamudazunu/fFjbieH/jujapesefeb.pdfIn PDF document text
    • https://cdn.sqhk.co/bimolixumotu/NviiijZ/jojevu.pdfIn PDF document text
    • https://cdn.sqhk.co/lodabazul/jhajfhi/8465356572.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/fewunadupop/kala_patthar_film.pdfIn PDF document text
    • http://vavadot.onlinewebshop.net/architecture_building_design_process.pdfIn PDF document text
    • http://funurebebepoti.epizy.com/synonym_and_antonym_coloring_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/download_light_novel_danmachi_indo.pdfIn PDF document text
    • http://wufikemofumop.atwebpages.com/duxira.pdfIn PDF document text
    • http://nejoselox.epizy.com/41043967623.pdfIn PDF document text
    • http://mubodadekutaxim.atwebpages.com/pikolemugekanazurakux.pdfIn PDF document text
    • http://jepuxaribizoze.rf.gd/cantilever_slab_reinforcement_details.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/crossword_answer_for_domesticated_polecat.pdfIn PDF document text
    • http://fijonomun.rf.gd/64924813995.pdfIn PDF document text
    • http://duloduxu.epizy.com/fitted_sheet_fold_with_elastic.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/ceebook_neco_answer_net.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/how_to_replace_heating_element_in_ge_spectra_oven.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_off0000e952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 5088 bytes
SHA-256: 5ace9f47c15a2c5a8f42f2028416e40fdc8d8f895b94b1d11c7713bc133dd52f
font_01_sfnt_off0000faa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA9 11172 bytes
SHA-256: 169bfe85a8e1e506fdbff371df34ef3836d34fd7238a60c75a76ce5dcd3d5dd8

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