Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd81ed7cca66c0b6…

MALICIOUS

PDF

70.9 KB Created: 2020-11-24 11:32:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ae352ab0edfc443891e18394f9655f95 SHA-1: c0e134fb4dfb299c982c3b23b9f22ce5711c1587 SHA-256: dd81ed7cca66c0b6c37c9218d7cc1ad6818b97f53118d93cabbc1f8a26d5652c
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to a malicious URL. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL, 'https://trafficel.ru/123?utm_term=test+cross+worksheet+answers', is identified as the primary indicator of compromise, likely leading to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://trafficel.ru/123?utm_term=test+cross+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369190/normal_5f99d39d14cc9.pdfIn PDF document text
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/267f068d.pdfIn PDF document text
    • https://jutawalafomas.weebly.com/uploads/1/3/4/3/134316275/ef27f7a059e96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5f8eb945b0f6e.pdfIn PDF document text
    • https://xebololu.weebly.com/uploads/1/3/4/3/134340913/lolaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5fa4130146d02.pdfIn PDF document text
    • https://rasuzumiketasak.weebly.com/uploads/1/3/4/3/134393825/wegumotulu_befiwijira_rived.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/mokuwanibof/robovilubujutivodakit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57f88f7d-38c6-485b-ba7a-8c8b3f69d5bd/3695018246.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/boxuvuwumuzarafonibosowa.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

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_off0000d8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DD 4960 bytes
SHA-256: c94be897ed5f522e9ac2fdef55e9ccbbcabaa07443a005c0231197322d139505
font_01_sfnt_off0000e9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 10968 bytes
SHA-256: ab9d4c3923630d4a998de2db210127009c294d18090fd70fae550c005575982f

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