Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91e9214fc45af34…

MALICIOUS

PDF

74.7 KB Created: 2021-03-23 02:36:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 236b80125d5f91101892f2e6ad138f77 SHA-1: 76024629ff917053b3129ef429b90f9497800353 SHA-256: b91e9214fc45af3493745c62efabf6e5d26d913bd8280218a8772e823601ab9b
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains numerous external links, with one specifically pointing to a URL containing 'award' and a book title, suggesting a lure for phishing or content theft. The PDF also exhibits characteristics of a link farm, designed to generate traffic or SEO benefits for malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=a+wrinkle+in+time+pdf+chapter+12
    • http://rimka.xyz/jopoterqqnr0.pdf
    • https://baxikulalul.weebly.com/uploads/1/3/4/5/134582220/vizoxuvubebe_fitukopoxide_gezulilegos.pdf
    • http://bit7.top/959557419328uw0g.pdf
    • http://vunusidaf.22web.org/85076643884.pdf
    • http://storedubai.shop/html_maintenance_page_template_freemgz7r.pdf
    • https://dolevomebebozap.weebly.com/uploads/1/3/1/6/131636651/dazuriwozera.pdf
    • https://dodesagetulisuv.weebly.com/uploads/1/3/4/9/134902864/pokodam_pevonitomubotil_juvovenakal_posopip.pdf
    • http://puxaxaguv.iblogger.org/21386209001.pdf
    • http://businesslinecenter.com/57736174540e4kq1.pdf
    • https://jimurapixow.weebly.com/uploads/1/3/5/3/135399705/jepirogakolemowu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pizexopenaxu/arteri_adalah.pdf
    • http://busojez.rf.gd/37969739579.pdf
    • https://s3.amazonaws.com/likerajatob/35520604982.pdf
    • https://s3.amazonaws.com/zexozavo/aldi_talk_app_android.pdf
    • http://pikegasek.epizy.com/duxotezoberusekukipadik.pdf
    • https://uploads.strikinglycdn.com/files/d23128cc-3743-4ad7-903f-dd96068f84fd/guess_the_logo_pic_answers_printable.pdf
    • http://pejonoma.epizy.com/sazuxizusefozurupulini.pdf
    • https://s3.amazonaws.com/xaliwalufoguni/sapna_choudhary_gane_song_video.pdf
    • https://s3.amazonaws.com/geradi/lego_mindstorms_ev3_building_guide.pdf
    • https://uploads.strikinglycdn.com/files/ac9200b2-ec6e-48a4-8e4f-4402cde95162/19199318615.pdf
    • http://nelaxufap.rf.gd/gopro_hero_4_second_hand_price_in_philippines.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e853.bin
a127b9fcfa53abf4b9def090454261e2316fe1bb860257dbabda040df29c2a59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE853 5544 bytes
font_01_sfnt_off0000fb1f.bin
839d1aa2aa05c09f2b218f433f7ae3bbef561fa882b87d4d57285b1a4d929ff3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 10144 bytes

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