Malicious PDF — malware analysis report

Static analysis result for SHA-256 75848569601e3d4e…

MALICIOUS

PDF

79.6 KB Created: 2021-03-25 03:04:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 831ae273c9460b681401face2164f213 SHA-1: 205f7fff69b97022c712fe98fb7c08122f4654d9 SHA-256: 75848569601e3d4ea999855761680df231172c799f7c1dd09c60d9e2baa70ab0
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary suspicious URL pointing to 'bologen.ru'. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/award?keyword=apec+summit+2020+pdf PDF link annotation
    • http://tabagobadirab.iblogger.org/mebuxagumato.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/kovatumidax.pdfIn PDF document text
    • http://gokawojop.scienceontheweb.net/24782621936.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/ihHHgi8/27019291945.pdfIn PDF document text
    • https://cdn.sqhk.co/bamikalagov/6ggi9ge/t_mobile_login_pay.pdfIn PDF document text
    • http://fikakutipid.mygamesonline.org/berenodisuzonewotitasov.pdfIn PDF document text
    • http://roworesezakor.iblogger.org/marshall_rosenberg_nonviolent_communication_quotes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/60c72c2e-cedd-4ec2-9479-dc365acfc094/xanathars_guide_to_everything_racial_feats.pdfIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/interior_design_sales_jobs_chicago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3177ac37-9f0b-45a9-acef-b1250faf6b0c/zazutorugovuwaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65935cb1-660f-4cc3-809f-4475cfddd9f8/giwupaxawupiwitelelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1268c4aa-ff96-47c4-9b2a-65f8fd2c7e73/sonimegugaxiwused.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1bf5778-68da-47f2-84da-519df16a3d23/can_i_get_my_w2_online_from_kroger.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/87079507409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17835ee3-095e-4d1a-b842-9893e573f445/sasuvomufawelonenabajil.pdfIn PDF document text
    • http://pidosowot.epizy.com/delonghi_lattissima_plus_espresso_machine_black.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/the_ed_schein_corporate_culture_survival_guide.pdfIn PDF document text
    • http://revifobatuge.rf.gd/toastmasters_general_evaluator_report_form.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/advanced_typescript.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_off0000fc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6A 5228 bytes
SHA-256: e71dd9e79e8fba1d100fb9c037e6f7596800647db984adb0dd665aaae05d9368
font_01_sfnt_off00010e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E32 10420 bytes
SHA-256: 34f4d74fc97bff5d848b831d5e6bc941dd5ca9f245630b38b8565737fa715b40

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