Malicious PDF — malware analysis report

Static analysis result for SHA-256 d748f57a9821cfa6…

MALICIOUS

PDF

84.5 KB Created: 2021-03-06 01:43:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 21487b99e27ce5003299732d31aa96b1 SHA-1: 521e60f7c8e6cc9d1974f8e767d3fc2ebfdeefe8 SHA-256: d748f57a9821cfa681af58af584bb43f1e46f3fdaf6d0ec5081e97f150707d49
194 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, suggests a lure related to 'free books', aligning with phishing or scam tactics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or conducting phishing.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=libros+de+carlos+cuauhtemoc+sanchez+gratis In PDF document text
    • https://cdn.sqhk.co/kifukuvitog/lf7s5jh/shooty_skies_oculus_quest.pdfIn PDF document text
    • https://cdn.sqhk.co/xolovagi/jgjgRjh/little_black_baby_boy_hairstyles.pdfIn PDF document text
    • https://cdn.sqhk.co/takivelalam/iakgc0p/nuvar.pdfIn PDF document text
    • http://munasimowijuxi.getenjoyment.net/75768226519.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/briggs_and_stratton_5hp_engine_for_sale_uk.pdfIn PDF document text
    • http://lunuganuxik.epizy.com/how_to_fix_a_cracked_pressure_washer_pump.pdfIn PDF document text
    • http://lowavizoviwu.epizy.com/65409716881.pdfIn PDF document text
    • http://tososite.onlinewebshop.net/stanley_45_combination_plane_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/online_zip_extractor_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/escape_room_answers_level_204.pdfIn PDF document text
    • http://tubiwebixepin.rf.gd/modern_dollhouse_furniture_1_12_scale.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/vufiz.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/gigubogawimobirodari.pdfIn PDF document text
    • http://duxuramubot.epizy.com/6367541348.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/pijapubej.pdfIn PDF document text
    • http://pukokudew.epizy.com/percy_jackson_sea_of_monsters_book_chapter_8.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAB 5484 bytes
SHA-256: 0ffe0406aa00ccce41d167e6bd249492e9febb785e06b48bad13b12318810c94
font_01_sfnt_off00011d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D28 11612 bytes
SHA-256: dbb692155987366c121c94102fac3d0aeedbf75148e462d9919ed58c8e8d56e0

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