Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca327f03b8c7d166…

MALICIOUS

PDF

82.3 KB Created: 2021-04-01 22:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d4821a5aed8a6a3763d59bf8db3588d7 SHA-1: 40dd34014149d79c72c35bcd1840c9b37bd7b136 SHA-256: ca327f03b8c7d166180c6084901d6a9c48d3afb6333b3eff14a7673a09def8b2
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 SEO redirector to disguise a malicious link. The embedded URL and the high-confidence ML classifier further support this assessment. The primary IOC is the malicious URL used in the phishing attempt.

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://nipisod.ru/award?keyword=chemistry+formulas+for+class+11+and+12+cbse+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408461/normal_600ba8aabfc10.pdfIn PDF document text
    • http://xevamoz.mygamesonline.org/how_to_cite_a_article_in_apa_style.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449793/normal_5feb096a1c297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478669/normal_600d00d33c8bf.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/61eec3ad-d716-4f9e-a010-3ba08c7f18e3/mercruiser_4.3_oil_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/58653631992.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/pezitubo.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/70425127727.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/whats_another_word_for_mental.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b472824-61f6-430a-921f-640b2f6b40f6/writers_choice_grammar_practice_workbook_grade_6_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e5792ff-69ed-4b73-9970-5a934965d671/infinite_campus_grade_calc_options.pdfIn PDF document text
    • http://nemiropeseti.rf.gd/tefefixapazokijif.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/najodidemazipuwujawiv.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/71370192491.pdfIn PDF document text
    • http://mujunego.epizy.com/7123604703.pdfIn PDF document text
    • http://roveramo.atwebpages.com/is_long_john_silvers_fish_bad_for_you.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/skype_version_7._32.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07913b57-df5e-4235-a908-b1e08a3c3650/yoga_book_c930_linux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c4bfe81-06ca-4393-af38-4fb6e0801036/how_to_replace_2005_toyota_sienna_radiator.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_off000103fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 5724 bytes
SHA-256: 653f9bd228153074cf57b241911795b422a56ef108872ed08d6ca34169a3dc5c
font_01_sfnt_off0001174d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174D 10672 bytes
SHA-256: f471fc4658f888667b6c5f04719395372f1f8c9880ab2e9b35c7cb8d714bd075

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