Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d6820ac7653d26…

MALICIOUS

PDF

98.0 KB Created: 2021-03-22 14:49:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dfc399b74a7875eb5ebd85e31cf3f9dd SHA-1: b520cdf49998c8b3d20324afa13a346fed0c1337 SHA-256: 05d6820ac7653d2651000355226246504966bd4c7a17b1d7b258164680853694
136 Risk Score

Malware Insights

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

The file is a PDF that contains a heuristic firing for an SEO redirector link, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV also flagged this file as malicious. The primary malicious URL identified is https://bologen.ru/strik?utm_term=terapia+cognitivo+conductual+para+el+insomnio+pdf, which is likely used to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=terapia+cognitivo+conductual+para+el+insomnio+pdf PDF link annotation
    • http://nukicew.xyz/zaker7no8m.pdfIn PDF document text
    • http://rikafitamedad.medianewsonline.com/19895362688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388279/normal_603a7e9eced1c.pdfIn PDF document text
    • http://fekevopimibun.sportsontheweb.net/61280821189.pdfIn PDF document text
    • https://cdn.sqhk.co/guxifunuris/hic3Yre/82669408145.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/windows_7_automatically_install_driverschxir.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/vOeNjeW/middle_finger_emoji_disappeared.pdfIn PDF document text
    • http://ighelpcenter.xyz/gz_motorsports_ls_vacuum_pumpj78ep.pdfIn PDF document text
    • https://cdn.sqhk.co/ximepadogi/KMxheyY/celebrity_equinox_cruise_ship_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476924/normal_603603681ba88.pdfIn PDF document text
    • https://cdn.sqhk.co/luxixumogez/d5zPhaF/logo_maker_2020_3d_mod_apk.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/salunjxphi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477387/normal_6010b690115b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410006/normal_5fdac78108ecd.pdfIn PDF document text
    • http://delinapod.mypressonline.com/hyundai_service_center_melaka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413110/normal_5fc6baf136fbe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/ladojenefe/wutuwuxetejagifed.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/chicago_bulls_uniform_font.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/china_gate_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/58340678003.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/53715997628.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/what_does_208cc_engine_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/jutitopawe.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/how_to_clean_chicco_nextfit.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/nivinovetova.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_off00012fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE6 5368 bytes
SHA-256: 9b896c661864c9be31092c40a38d79f8ae48adbaea6ee3b17712814e6552ccd9
font_01_sfnt_off0001420c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1420C 12348 bytes
SHA-256: f412736ea9330ffcb7a3b6911a3e43dfbcd42d0743467858b8c6999b1df40113
font_02_sfnt_off000169f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169F5 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34