Malicious PDF — malware analysis report

Static analysis result for SHA-256 54029baff40c4c86…

MALICIOUS

PDF

70.9 KB Created: 2020-11-24 23:27:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: de624e1184939d257f137e8ae61a4234 SHA-1: 7c0e42859f62ce636a89585a505569d5281aa7da SHA-256: 54029baff40c4c8688e1067874d49f235bfe23e07d17d0b11e22ccc1a56dcc25
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a high-severity rule indicating an image lure linking to an SEO redirector for phishing. ClamAV also detected it as a phishing trojan. The embedded URL, https://trafftec.ru/strik?utm_term=z+shadow+home, is the primary indicator of compromise, likely leading to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://trafftec.ru/strik?utm_term=z+shadow+home PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409258/normal_5fad3b236d887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471474/normal_5faaaa828723a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368951/normal_5fa924b5b8666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486535/normal_5fb3f5186ee80.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/0065551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371005/normal_5f95ec3412206.pdfIn PDF document text
    • https://zujafewisanepo.weebly.com/uploads/1/3/4/3/134322282/nediwirirekasigiza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447888/normal_5fab0ca1ca3f0.pdfIn PDF document text
    • https://jakoxizejibak.weebly.com/uploads/1/3/4/3/134348863/1993083.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/fejenijovekozu/fafajigufegez.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/32722051133.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/vokuwe.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/82890309993.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000f1a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF1A5 18328 bytes
SHA-256: 8b58f663697d901f7185ec9d1ebf6c8bf35d3d7843d7b0a9e6dd2e3e861753b8
font_00_sfnt_off0000bc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC06 4988 bytes
SHA-256: 1b9475f14c14e467b0d8d6ba02594787d27e0e05c46527c3d458abb34fb7b598
font_01_sfnt_off0000cceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEB 10696 bytes
SHA-256: 74808b6636f4c19a15f04b8c47bd8b8d60401d8055e0780e0922eea394ac9f9d

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