Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b9d024a3c77e63…

MALICIOUS

PDF

91.7 KB Created: 2021-03-07 21:44:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4e5c4ea117853bb9f7039d2beb9be361 SHA-1: 2ad6582569f1db35d9d8136731b4e909ade09519 SHA-256: 21b9d024a3c77e639888e3ef14c627caf65eb38007c122c2cc1028bc6ebee4d9
136 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating it functions as a redirector link for phishing or malware distribution. The embedded URL, 'https://xezojetit.ru/strik?utm_term=battletech+game+mech+guide', is likely used to direct users to malicious content. No scripts were extracted, but the PDF structure and URL suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=battletech+game+mech+guide PDF link annotation
    • http://phillipen.online/nordictrack_t5zi_specsi2cuz.pdfIn PDF document text
    • http://itslm.fun/badrinath_malayalam_movie_3gpqpiig.pdfIn PDF document text
    • http://heretythere.site/boss_baby_2_hd_movieyg749.pdfIn PDF document text
    • http://hihikane.space/netumavixezobemodel129r.pdfIn PDF document text
    • https://cdn.sqhk.co/nazutupim/jb99Fx9/387161386.pdfIn PDF document text
    • http://fb-pageunderreview.com/kenmore_elite_dishwasher_clear_error_codes19x1o.pdfIn PDF document text
    • http://dorightschool.com/crossfire_series_book_29ne1y.pdfIn PDF document text
    • http://ledy66.net/14125158147iwyt1.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafuzivega/gghgi6E/autodesk_sketchbook_application.pdfIn PDF document text
    • https://cdn.sqhk.co/sirojenu/5zQztlL/xugibi.pdfIn PDF document text
    • http://legendarycraft.ru/paboxanosufidotibozuxukso14b.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/purixifusipelid/5552866783.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/arcade_game_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/wazorawoxelumoba.pdfIn PDF document text
    • http://titasukutisun.epizy.com/air_force_meritorious_civilian_service_award_template.pdfIn PDF document text
    • http://juwesuzibu.epizy.com/action_sheet_android.pdfIn PDF document text
    • http://fijinibegomiba.rf.gd/b._sc_nursing_syllabus.pdfIn PDF document text
    • http://zovawawopo.rf.gd/88036955395.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/executive_summary_sample_for_construction_project_report.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_off00011e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E40 4796 bytes
SHA-256: 428a8c85aadf207691caf2abcbf7f4a007eb4de555f43455bf8c9ba667a75cec
font_01_sfnt_off00012e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E92 10752 bytes
SHA-256: 1a166e04679aec1dc7a5900d0b2bc0797a6620b19eaf23b1eaf7519f66be9155
font_02_sfnt_off00015348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15348 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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