Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04e0a5b2854f748…

MALICIOUS

PDF

74.0 KB Created: 2021-05-12 01:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8fcc1b423ae634d6fb9721a862f74802 SHA-1: 02e8a45bab895a2cd4ebce6006ef8639d2447e0d SHA-256: e04e0a5b2854f748a35c06c1ed4d2f32384525213d9b056122fb7c7df7f806a4
136 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a redirector URL associated with a 'free-download phishing' lure suggests the document is designed to trick users into visiting a malicious site. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=bill+nye+the+science+guy+rocks+and+soil+schooltube PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379618/normal_5fce619bb19b7.pdfIn PDF document text
    • http://kaxakewilej.iblogger.org/muzibiremixigepoxikob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377912/normal_5fe68c5662d64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479435/normal_6004703f456a1.pdfIn PDF document text
    • https://wigikezidewuti.weebly.com/uploads/1/3/4/5/134578964/vovazisi.pdfIn PDF document text
    • https://gidisapawifo.weebly.com/uploads/1/3/4/6/134611794/goguwiz.pdfIn PDF document text
    • http://dedarijaluwonu.22web.org/6671494134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_6012e6fb275b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494661/normal_60684bfe015c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pimoxonevuwewax.atwebpages.com/garmin_montana_650_battery_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1149a498-d962-435a-b040-7c9d3982c624/fuziruwojomukafafu.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/c_wpf_textbox_binding_string_format.pdfIn PDF document text
    • http://gegurobaz.myartsonline.com/hole_s_human_anatomy_and_physiology_12th_edition_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/char_broil_air_fryer_turkey_breast_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/anjaan_movie_songs_video.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/maths_borrowing_subtraction_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00189207-aa7e-4c8e-a410-22689bfbe9c9/nj_transit_bus_164_holiday_schedule_2020.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/gufog.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/78701877119.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD06 5556 bytes
SHA-256: db6a96729dae80ec94bbc4ef123f8d18096a7990670724bb2128c4fa3be90b48
font_01_sfnt_off0000dfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEC 10752 bytes
SHA-256: c5f72d7a0be91bc953bdd6baeb9dd6a590209fb0a0041f66a57552efc78e1808
font_02_sfnt_off000104b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B3 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501