Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36f50274667a624…

MALICIOUS

PDF

74.9 KB Created: 2021-02-17 12:56:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 240fcc8a36c46b09e73a8903a3a8fb64 SHA-1: 2b7af6abb00eaa75e2b91a4d59cc0ddd6c6316a9 SHA-256: f36f50274667a6246382efbb232615bb57baeecb6c32cccf29878861b303d819
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a link that redirects to a known malicious URL, identified by heuristics as a redirector for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain metadata related to the redirector's lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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://yafferge.ru/wix?keyword=pop+up+laundry+basket+with+wheels In PDF document text
    • https://static.s123-cdn-static.com/uploads/4422392/normal_5fcec0ef13433.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416305/normal_5fedc902e3b7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490519/normal_600f3dc73b31b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501993/normal_5ff5baf0e3940.pdfIn PDF document text
    • http://zuluwana.iblogger.org/vavumunozodejufukobukufu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503584/normal_5fd87fcd81395.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/copperplate_calligraphy.pdfIn PDF document text
    • http://walefusariwe.epizy.com/12054205071.pdfIn PDF document text
    • http://povalimokuwov.rf.gd/how_to_set_up_a_roaster_oven.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/whatsapp_baby_dance_videos.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/latest_android_sdk_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/34485408348.pdfIn PDF document text
    • http://bagomilovop.epizy.com/tavotapakosufom.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/vuxapasosozesogaloza.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/3829848402.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/molecular_polarity_lab_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/daboko.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/9990473346.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_off0000e880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE880 5444 bytes
SHA-256: dd257cd0362eb2f0df61455afa1854ea8801fb0266d56f1fbcc8b21b8863e1b6
font_01_sfnt_off0000fb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0A 10480 bytes
SHA-256: b778b874f3c29108d74524077f7233385e80626087a7d847db470e75e3d5da68

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