Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ee475d127286fe…

MALICIOUS

PDF

78.6 KB Created: 2021-04-26 03:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 451e0d53767653abd3a7e5a622038398 SHA-1: cb038aaba279ab43d39cb19d58b0f8f8b977cf23 SHA-256: 38ee475d127286fe1a95d5bf33f2a0ae6d19b1e099d1bcf172512c356eb30106
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_UTM_REDIRECTOR_LINK heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains text related to a movie lure, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://dafemum.ru/strik?utm_term=me+before+you+movie+online+youtube In PDF document text
    • http://sunugukumota.getenjoyment.net/dipugavuvododezurijegaken.pdfIn PDF document text
    • http://revershjtb.site/98929541688y7odz.pdfIn PDF document text
    • http://busimaderule.mywebcommunity.org/autismo_causas.pdfIn PDF document text
    • http://monstergym.ru/63765871216u8w0c.pdfIn PDF document text
    • http://good-production18.site/407191448124ze8q.pdfIn PDF document text
    • http://tublitalia.fun/geography_quiz_questions_and_answers_hard0um7i.pdfIn PDF document text
    • http://lotukaguw.sportsontheweb.net/paisabazaar_credit_score_password.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/41c88afa-29d7-48b7-910c-fa2a9e710327/76146254515.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/saitek_x52_profile_editor.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/introduction_to_anglicanism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b830722-8f88-4bc5-9535-71f811e5a0e1/biologia_celular_y_molecular_de_robertis_16_edicin_descargar.pdfIn PDF document text
    • http://bamonoxo.onlinewebshop.net/alter_ego_4_hachette.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/60645466973.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/new_asthma_guidelines_bts.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/pekanumanuwupanuxab.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/93907140528.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/bobosupox.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/black_sesame_ice_cream_taste.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e484fb1-3a12-4417-9ea7-c3eab1901f8e/oh_lord_our_god_how_excellent_your_name_is_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87752e8e-a93b-4ae0-8530-7b7ef4aaaa2e/60822928691.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_off0000f6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B1 4832 bytes
SHA-256: f243eb3edb3966d877fe29c36da7fc746749e899a7b291ae5da0d561476ea24b
font_01_sfnt_off00010724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10724 11348 bytes
SHA-256: eddb1e3c77f1b0d859053e480ebb89a8b8fe1496bc99bc0b483744335b58f448

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