Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe10dea2564e8c09…

MALICIOUS

PDF

79.2 KB Created: 2021-03-29 09:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a881e3bc596bf75c27e2ebbf8b86bf4c SHA-1: 2b6d298a098351cc53a0e95f940972f7845d1156 SHA-256: fe10dea2564e8c09eaf9ee36501c1c965cba718599e22a605329116aec69b934
136 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it uses an image lure to redirect users to an SEO redirector, likely for phishing or malware distribution. The embedded URL 'https://zajinet.ru/wix?keyword=maus+chapter+4+questions+and+answers' is a key indicator of this malicious activity.

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://zajinet.ru/wix?keyword=maus+chapter+4+questions+and+answers PDF link annotation
    • https://cdn.sqhk.co/tixuniwe/hiczvii/dekikeruwebexomekog.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/hcOhhii/33559167941.pdfIn PDF document text
    • https://cdn.sqhk.co/rowalulo/nA2Oquo/wuthering_heights_kate_bush_sheet_music.pdfIn PDF document text
    • http://dudakarebonadi.iblogger.org/livro_marketing_e_arquetipos_helio_couto.pdfIn PDF document text
    • https://cdn.sqhk.co/nezipumosot/hK8hdEF/box_office_definition_synonym.pdfIn PDF document text
    • https://cdn.sqhk.co/vatopibar/bhjcggN/4853587932.pdfIn PDF document text
    • https://cdn.sqhk.co/wofetewa/e3ihhR0/49582107871.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/jWhawda/b_52_bomber_dropping_payload.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/Vjajehh/posat.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/idfAw4J/the_short_second_life_of_bree_tanner_audiobook.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/xefukonaxiwokurao72.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/jgNjcji/22278538716.pdfIn PDF document text
    • https://cdn.sqhk.co/duwenaxiseve/Vicijhc/piano_keyboard_notes_for_beginners.pdfIn PDF document text
    • http://ru-1.casa/chemotherapy_extravasation_guidelines_20152rjrb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kiburomuwilun.epizy.com/78871685941.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/73703544378.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/76791632786.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/89858954696.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_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 5440 bytes
SHA-256: 648401c605e54f602419ee61b5b84966f2618a7e8b99df3ea6677df7e051cd80
font_01_sfnt_off00010b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9E 10588 bytes
SHA-256: 378196cce9694bdfe083a064186e4d045f4d11c0a4705f22af73492c2d0aebf3

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