Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a903f044ae1b7a0…

MALICIOUS

PDF

75.3 KB Created: 2021-04-18 21:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8fa49fdd912636328c9b7c1875a34fc8 SHA-1: d02daa589364c46b0b943924c0bc03e892f5bb25 SHA-256: 1a903f044ae1b7a00aaf5752897d1b85799a450c50f2e782fc2bc55002b7d3c7
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It contains an embedded URL that redirects to 'https://maypoin.ru/strik?utm_term=how+to+connect+jbl+flip+4+with+laptop', which is identified as an SEO redirector for free-download phishing. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The primary attack vector appears to be luring the user to a malicious site via a deceptive link.

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://maypoin.ru/strik?utm_term=how+to+connect+jbl+flip+4+with+laptop PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465249/normal_601de04591bac.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/eM9Fsii/best_notes_app_for_chromebook.pdfIn PDF document text
    • https://cdn.sqhk.co/bozadukopufu/Jbjghb8/zombie_army_4_dead_war_pc_steam.pdfIn PDF document text
    • http://sigixexizo.sportsontheweb.net/cambridge_academic_english_b1.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/hhWkIgj/words_using_s_h_i_n_e_d.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/DhfZMgj/at_t_prepaid_refill_card_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489976/normal_6002956734d80.pdfIn PDF document text
    • http://warokibujiz.getenjoyment.net/54305972905.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luzojora.atwebpages.com/nutrition_books_for_bodybuilding.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/kirowader.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/what_happens_after_30_days_of_working_out.pdfIn PDF document text
    • http://kolawevifo.epizy.com/1773313110.pdfIn PDF document text
    • http://wotexel.rf.gd/nimexigukafa.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/ensayo_del_seor_de_las_moscas.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/android_9._1_huawei_p10.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/pakistan_cotton_bed_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/bumogusexakamesivumuxezon.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/xupixoxupikovugefut.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_off0000e944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE944 5188 bytes
SHA-256: af4426b0c3835bd1da8878b4d8bdbab6183ef845f25767ea587fb0f5eb9d19cd
font_01_sfnt_off0000fb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB07 10988 bytes
SHA-256: da69a80fc34d0df60473e7d75c955833afd260c77fbff308d689cec4059dd665

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