Malicious PDF — malware analysis report

Static analysis result for SHA-256 0870d20812639935…

MALICIOUS

PDF

73.2 KB Created: 2020-12-14 03:40:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 10f770182f748635163e38e0584748b2 SHA-1: affc94c24250d4a7336894de28f777a3749c2a50 SHA-256: 0870d20812639935dfb513d7bae853bc3d5bbc588c7853747f13ba0526713625
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/123?utm_term=joey+rodriguez+mma'. ML classification and ClamAV also flagged this PDF as malicious. The embedded URL is the primary indicator of malicious intent, likely serving as a lure for phishing or to download a secondary payload.

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
  • 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://cctraff.ru/123?utm_term=joey+rodriguez+mma In PDF document text
    • https://static.s123-cdn-static.com/uploads/4425256/normal_5fcb3256d479d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422373/normal_5f99ac044b142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380210/normal_5fb9a3f696ed1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5fb9fb6aad52d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413469/normal_5fce98bde29f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457604/normal_5fa707c6c2866.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/9373972.pdfIn PDF document text
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/827122.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388283/normal_5fb7105aa8c74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf66fff8cdb769c6db0f75/1606379264429/fubozijimesilizil.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc55f378139af037662f8a9/t/5fd19fbfeeaf2774ac89491e/1607573440336/skipping_rope_exercise_benefits_in_tamil.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e701bda9c57a97be38be/t/5fc1542b5147b1480464ea6d/1606505515282/64196758616.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/cercle_de_la_forme_st_lazare_planning.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_off0000e180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE180 5076 bytes
SHA-256: ef0402daea34ace4dfb454a634ca38747e282cb3dd634efacd442afad36217c7
font_01_sfnt_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 11464 bytes
SHA-256: 238af18eb4744cb6c5df3c48ffc7d79fb44e68f979972bafb7035543c03e7995