Malicious PDF — malware analysis report

Static analysis result for SHA-256 c116e327b93d07a4…

MALICIOUS

PDF

81.2 KB Created: 2021-03-29 22:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b2f8e6e10167badab0724bf15234f74c SHA-1: 14a7d02c11d8c12239f18f3c6520bfc422a5c2ad SHA-256: c116e327b93d07a4b1612e4c1b1a38928b2bb8bc7b5321fcee5c5d3a657008cc
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a heuristic firing for a "free-download phishing" lure, directing users to an external URL. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL, https://maypoin.ru/aws?utm_term=top+10+greatest+moments+in+american+history, is the primary indicator of compromise, likely leading to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/aws?utm_term=top+10+greatest+moments+in+american+history PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393022/normal_604ce44135487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418175/normal_5fda8281399bb.pdfIn PDF document text
    • https://cdn.sqhk.co/bixedazofas/iqpZsie/vallejo_panzer_aces_color_chart.pdfIn PDF document text
    • http://lawexape.mygamesonline.org/acceleration_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/Hgdihua/32504043160.pdfIn PDF document text
    • https://cdn.sqhk.co/xonarewu/hivhjji/lrtemplate_to_dng_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/sWI2icZ/hospital_pick_up_lines_tagalog.pdfIn PDF document text
    • http://daxavepevepa.mypressonline.com/88935184280.pdfIn PDF document text
    • https://cdn.sqhk.co/kosibowo/I4hajeu/puxiwokulixe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd94b313-77bb-4f1c-9a09-39d9d11fe7a3/66315581056.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/jotolig.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/giparanodeta.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/what_is_a_firmament_according_to_the_bible.pdfIn PDF document text
    • http://bavatesivo.myartsonline.com/possessive_genitive_case_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/springform_bake_pan_set.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/formal_attire_for_wedding_guest_male.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/crochet_pattern_for_afghan_using_bulky_yarn.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/54767327524.pdfIn PDF document text
    • http://gajutar.onlinewebshop.net/a_raisin_in_the_sun_act_3_scene_1_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/661b1084-68e8-4beb-8397-6b64bd49bdab/good_adjectives_to_describe_a_forest.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_off0000fd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9C 5560 bytes
SHA-256: 77c69366694343acdc3776fa245671b78cb06bc2ca4e680cf25f0307b1aefdb7
font_01_sfnt_off00011076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11076 11540 bytes
SHA-256: 580f4b3d1ca98256f59b4dcb07467aa31f39907ab860e9cdac7e19997cda7a68

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