Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81a140fb02c8574…

MALICIOUS

PDF

73.4 KB Created: 2021-03-25 07:05:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 44f4957fa5059c8e6ca6f6c3dd3a93b0 SHA-1: 01e642f5a34d0f34cc4f56a25eff567cffd9020c SHA-256: d81a140fb02c8574d0e3eca67e9a1fa4a6d2d00022931c7f7294c73b933aa453
134 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm and has been flagged by ML classifiers and ClamAV as malicious phishing content. The embedded URL and the document body suggest a lure related to 'free diet pills free shipping' to entice users to click on links, likely leading to further malicious content or downloads. No scripts were extracted, but the overall structure and URL reputation point towards a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/wix?keyword=free+diet+pills+free+shipping PDF link annotation
    • http://selomankap.space/zed_build_guide_aram1tqb8.pdfIn PDF document text
    • http://doweryklkq.space/62677498580cx2m4.pdfIn PDF document text
    • http://tabikola.online/what_does_icao_annex_17_specifyxt94r.pdfIn PDF document text
    • http://save50.pro/how_to_use_non-genuine_epson_ink_cartridgesdhiq2.pdfIn PDF document text
    • http://mobutadaxez.medianewsonline.com/blank_calendar_2020_download.pdfIn PDF document text
    • http://rijunoje.mygamesonline.org/what_ammo_do_navy_seals_use.pdfIn PDF document text
    • http://stroiline74.ru/que_es_inteligencia_emocional_en_espaolv6534.pdfIn PDF document text
    • http://allostar.buzz/oppo_r15_launch_date_in_indiaf7xo6.pdfIn PDF document text
    • http://fuvidevifa.scienceontheweb.net/who_was_the_little_girl_in_twilight.pdfIn PDF document text
    • http://creditscoreusa.info/77317064084awduk.pdfIn PDF document text
    • http://kekebol.iblogger.org/gujarati_bhajan_aarti_free.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/sql_query_exercises_with_answers.pdfIn PDF document text
    • http://punubukotulanes.22web.org/socializing_the_individual_worksheet_chapter_4_answers.pdfIn PDF document text
    • http://belldiscount.ru/nudovujavijunapejilztid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://belajuba.epizy.com/anna_may_wong_performing_the_modern.pdfIn PDF document text
    • http://nukasero.epizy.com/39530859662.pdfIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_fb83c6b8b198498aa0c2d45e02985db3.pdf?index=trueIn PDF document text
    • http://foxukekamusun.onlinewebshop.net/nabaxolerepivagutejaradem.pdfIn PDF document text
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_3e17826c856840b68f24c0bcda0c443a.pdf?index=trueIn PDF document text
    • http://vemevusakeke.epizy.com/modelo_de_articulo_de_opinion.pdfIn PDF document text
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_a3752c8ea5fa4ecaa5d8bc6e8f2e0023.pdf?index=trueIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_3ec4f22a6ad04178867345923a568864.pdf?index=trueIn PDF document text
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_5bc96511e8c945998feb1b963bc460b0.pdf?index=trueIn 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_off0000e119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 5048 bytes
SHA-256: 940f6941d48a0bec4dcc23398f282b4556244a98491c908669d8ea8af5e844d5
font_01_sfnt_off0000f24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 11356 bytes
SHA-256: 73f3ed482d546602e2141e3ba6a0fa26547035ea846984c0969d002351a02158

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