Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba087449afc14aae…

MALICIOUS

PDF

80.8 KB Created: 2021-04-30 03:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: da1ceae3b21e2ea2b54ab8e1344f8258 SHA-1: c4b0c4fa23c6dd34d9a70f022c8b348f046394ba SHA-256: ba087449afc14aae5b70b7a384ff47a177296bc230c116e4fc2a31200a7febbe
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high-confidence heuristic firing for a redirector link, specifically pointing to 'https://mezovuduw.ru/strik?utm_term=ryobi+drill+press+chuck+key'. This URL is likely part of a phishing or malware distribution scheme, aiming to trick users into downloading further malicious content. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', reinforcing the malicious nature.

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
  • 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://mezovuduw.ru/strik?utm_term=ryobi+drill+press+chuck+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393189/normal_6026328852b39.pdfIn PDF document text
    • http://wei-nmvc.com/seturideyl0au.pdfIn PDF document text
    • http://murimubijejaba.mygamesonline.org/concepto_de_alcoholismo_segun_la_oms.pdfIn PDF document text
    • http://betmoy56.com/75370579107g6hsr.pdfIn PDF document text
    • http://idealicagocce.site/98772544997dfu45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453901/normal_6041a06fe0768.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jofijegisa.atwebpages.com/cause_and_effect_examples_sentences.pdfIn PDF document text
    • http://bukezodebas.onlinewebshop.net/apsc_exam_question_paper_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/obosheshe_amra_natok.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/guziworafen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7de67b7-5526-4369-b97a-38fffb1fd210/donald_duck_in_mathmagic_land_worksheet.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/62245248910.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/skyrim_behind_the_curtain_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b51a2684-6dfe-474f-9395-5ab549878118/nezimi.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/shakespeares_play_the_tempest_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/31872388805.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/13388597701.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/13170979300.pdfIn PDF document text
    • http://wojibikifi.myartsonline.com/arnold_schwarzenegger_modern_bodybuilding_encyclopedia.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_off000100c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 5264 bytes
SHA-256: 2bac8fcb9d6609ecde9363eb8ed49c7ab5b187f34668d96d5b40f5aa231f2675
font_01_sfnt_off000112a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A7 10708 bytes
SHA-256: ca071193b2705fd0aab731867600c8ad08b6b3406d46d073e4b81c4ed404e927

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