Malicious PDF — malware analysis report

Static analysis result for SHA-256 b976b27befcd07c1…

MALICIOUS

PDF

73.5 KB Created: 2021-03-25 03:16:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: dff53db332d219b8caad92caef18d49d SHA-1: 5c22d7426c36c0ae72af84b20a246eb25614f683 SHA-256: b976b27befcd07c1cc5e5a0cdeabbec20341c7f264ae65fd0aa04841d293381e
156 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. The PDF contains a large number of external links, suggesting it is part of a link farm designed to drive traffic or distribute malicious content. The primary URL identified, https://golowaki.ru/award?keyword=calendario+2020+argentina+pdf+para+imprimir, appears to be a lure for users searching for a calendar, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/award?keyword=calendario+2020+argentina+pdf+para+imprimir PDF link annotation
    • http://pikufufunuti.scienceontheweb.net/geseju.pdfIn PDF document text
    • http://ipoteka.net/712854170756m1wq.pdfIn PDF document text
    • http://rukozhop-guide.com/6384363299qmazo.pdfIn PDF document text
    • http://konsalting.info/dirt_devil_power_max_xl_vacuum_cleaner2lrmx.pdfIn PDF document text
    • http://fesalasan.mygamesonline.org/84069513964.pdfIn PDF document text
    • http://xamojopilupivo.scienceontheweb.net/bronchiolite_virale_chez_nourrisson.pdfIn PDF document text
    • http://koreanluxe.com/59089016902w0mbj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_f6fe8e610fad4e9bb350c971c2d38522.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/angular_7_form_select_example.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/supuvexafujizufib.pdfIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_ec0e8c72d1884779bca30f69d8f5e39b.pdf?index=trueIn PDF document text
    • https://592f3795-292b-4eb7-bb82-ca7d83343d16.filesusr.com/ugd/44d997_b47db26f271a4dbd9d9be6af42b6aefa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bojafazes/what_is_the_fastest_method_to_solve_a_rubiks_cube.pdfIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_de5b1dc26bb74bcd9cd20bab59c98ceb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/25172922766.pdfIn PDF document text
    • http://timagugovoxo.onlinewebshop.net/tumapatupomupukepuxed.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/83385581554.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/guided_meditation_for_pain_relief.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/agro_informatics_define.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/vuzevofegogafudefutam.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_off0000dedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDF 5360 bytes
SHA-256: 3dbb4c52b0a49cbae0fb55a09bccb5eba4892fa9ca58a145bc93c1ff1b2794a0
font_01_sfnt_off0000f101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF101 11576 bytes
SHA-256: f1f95a73f8b60b6990445c436db92aca15a7baef8d34d7c4cb38e56ab1fcbc25

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