Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f35b03cb5abb253…

MALICIOUS

PDF

73.2 KB Created: 2021-01-15 00:40:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: dc86b12bc6238b465a6bf87edb1b5ce9 SHA-1: 9ce3f50e47f76b774b5d871b6c193015d992eb58 SHA-256: 6f35b03cb5abb2533ab47a0fe36e060116ab0775baf7025a24bcf7260061e1d0
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The embedded URL `https://trafffe.ru/aws?utm_term=answer+to+what%2527+s+up+doc` strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF format and the nature of the URL indicate potential for embedded malicious JavaScript or other exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/aws?utm_term=answer+to+what%2527+s+up+doc PDF link annotation
    • https://site-1173658.mozfiles.com/files/1173658/driving_school_2017_pc_indir.pdfIn PDF document text
    • https://felavutiz.weebly.com/uploads/1/3/1/1/131164211/8a2f329530a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384655/normal_5fc7b497ee3a5.pdfIn PDF document text
    • https://cdn.sqhk.co/fezozepefik/cjcbdSF/nail_art_kit_meaning.pdfIn PDF document text
    • https://site-1220223.mozfiles.com/files/1220223/47507678521.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451230/normal_5fb857ac3eb42.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/Q99eogd/lepenojaxivok.pdfIn PDF document text
    • https://site-1177111.mozfiles.com/files/1177111/chiari_malformation_awareness_stickers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380700/normal_5fa518b69eabb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403818/normal_5f9aea5202ab4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 5244 bytes
SHA-256: e2e4fb05da1db197a7b6425a8cde41ee6223f47d62fdc13732b8c374bfb735c4
font_01_sfnt_off0000f304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF304 10844 bytes
SHA-256: fb8bf39fc91a9fb9d4e5554b28f2bd4be0638dcb0b9facff0c403ca347f928e6

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