Malicious PDF — malware analysis report

Static analysis result for SHA-256 41bbf7ba28171a96…

MALICIOUS

PDF

113.6 KB Created: 2021-01-23 19:39:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0288390ac5ea6e066e4d5299a16cfea6 SHA-1: 9f9a489ba518693d4b9007e2f3a90529c92eb4cc SHA-256: 41bbf7ba28171a964f0604655a30ee221330d5184166e67b6da0fc38f1202096
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link disguised with 'Halo reach stats steam' which is flagged as a malicious redirector. This indicates a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file, suggesting it's designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffking.ru/123?utm_term=halo+reach+stats+steam In PDF document text
    • https://cdn.sqhk.co/nakunadubux/7hghe3U/fepoda.pdfIn PDF document text
    • https://site-1174576.mozfiles.com/files/1174576/totovapus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463808/normal_5fcf510381800.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473410/normal_5fcf5ccbb89bc.pdfIn PDF document text
    • https://site-1256452.mozfiles.com/files/1256452/dufapajozifogukip.pdfIn PDF document text
    • https://site-1166655.mozfiles.com/files/1166655/amu_admission_form_for_class_9th.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445326/normal_5fe33d9b10871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478125/normal_5fea16155742e.pdfIn PDF document text
    • https://cdn.sqhk.co/kokademesuz/jj0RI8c/sodowe.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/fapaga/gomimukumopu.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/xukapuratozo.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/create_a_worksheet_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/65509337917.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000170fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170FA 5164 bytes
SHA-256: 3b6e3cc53c86392e3963b70e263cba34f79c4a6a4d2a654265f672afa7455866
font_01_sfnt_off000182b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182B8 5000 bytes
SHA-256: c325a1ce26e05479e6cc2e1a47416d000e5922227e6eb6c1ac404472f9d8d407
font_02_sfnt_off00019386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19386 10988 bytes
SHA-256: 0e06c46c369f3f3c80d3906c9503cc5d084f0e688b7321164dfb6bee24f75781

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