Malicious PDF — malware analysis report

Static analysis result for SHA-256 570cc5be65fb8455…

MALICIOUS

PDF

73.2 KB Created: 2021-01-13 17:07:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 38fbd3cb2de8caa34059bfacf0e20d51 SHA-1: b6e291ecf1f68c4a5f0449f4686f899bb91b959d SHA-256: 570cc5be65fb8455644784d12d57f3fa78c5ac65f87ace7a01f0e5221a540eee
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it's a phishing lure, specifically using an image to redirect users to an external URL. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URL, https://trafffi.ru/aws?utm_term=dumaguete+siquijor+travel+guide, is the primary indicator of compromise, likely leading to a phishing page or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/aws?utm_term=dumaguete+siquijor+travel+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381528/normal_5f9b706210f21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392220/normal_5f92720a9e7f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480884/normal_5faa21d3e5870.pdfIn PDF document text
    • https://cdn.sqhk.co/jemajujo/jhMicgg/minokutudo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424010/normal_5fe4d9dbb7f71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425483/normal_5fc71898b4af7.pdfIn PDF document text
    • https://site-1176155.mozfiles.com/files/1176155/43836050483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_5f9138b6941c9.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/betefowubevat/62490596374.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/jofuwovusa.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/78698058962.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/21267388249.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE179 5408 bytes
SHA-256: bfecfe489bb2b68e22ed6ac2fffb03a01f74142eed0aa9c61127ce35c677a458
font_01_sfnt_off0000f3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C9 10660 bytes
SHA-256: 411c846cbbcb6dd086aa08d48e9dffab2c94060ea65f3d4512cf0834612ac68b

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