Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cfe5acbcf2c00d…

MALICIOUS

PDF

72.3 KB Created: 2021-02-24 14:51:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1ebb3f122ec849bd4ffc9f55a4605527 SHA-1: b307e8422b8a250f751a7a76f4d0817f6fe2c6a8 SHA-256: 37cfe5acbcf2c00d55de2d122b503aab80759c9eca7dd769efa42a5e16c374ce
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious phishing content. The 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristic specifically indicates a phishing lure designed to redirect users to malicious content via the URL 'https://jottigo.ru/123?utm_term=where+are+filters+on+shark+lift+away'. Although no scripts were explicitly extracted, the nature of the PDF and the embedded URL strongly suggest it's part of a phishing campaign, likely leading to further 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://jottigo.ru/123?utm_term=where+are+filters+on+shark+lift+away PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452381/normal_5fc6dec99a2cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488560/normal_5fec03bec483f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476147/normal_60068e31745e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451208/normal_5fe8fab3c2da2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452372/normal_600d8bb51a0f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392199/normal_5fc6db2be7513.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418755/normal_5ffc99d0ec220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486200/normal_602767a884185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421335/normal_602d36b792a5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401703/normal_5ff71a536515a.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxaroposa/giUhcxB/powerbass_asa_1500._1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476436/normal_6006ca8473336.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455403/normal_5fe6256b06b3e.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/zufojadibi/billions_arousal_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/email_mentor_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/image_asset_android_studio_3._0.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/black_hawk_down_soundtrack_list.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_off0000de12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE12 5124 bytes
SHA-256: 73075ae08a8da76f5cfd458c740734e60a85a4417193cebe437dc631253d3416
font_01_sfnt_off0000ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 10700 bytes
SHA-256: 85e0e626013015fa795692c89695cd88e7556c69d4c0c5678c83819f5261346b

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