Malicious PDF — malware analysis report

Static analysis result for SHA-256 19aee6cfd4edc2dc…

MALICIOUS

PDF

83.9 KB Created: 2021-03-19 23:32:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b153a2cf70e95af7a224b42103e92d2 SHA-1: 2cb0971efae5dbbe468c14da2c858c18b1970fd4 SHA-256: 19aee6cfd4edc2dc90be13e4d05098e806f4dda32f5a3658d6207a1e4605eecc
156 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, exhibiting characteristics of a phishing or SEO link farm attack. It contains numerous external links, many pointing to PDF files, suggesting an attempt to redirect users to malicious content or manipulate search engine results. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate this malicious intent.

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://ponafet.ru/strik?utm_term=timex+expedition+indiglo+watch+strap
    • https://cdn.sqhk.co/tefozakozup/9ifhgjf/slingshot_shoot_arrows.pdf
    • https://cdn.sqhk.co/fitijusepako/3heygi3/nunegizijevenudon.pdf
    • https://cdn.sqhk.co/wugunifikezu/XKZNHii/78819959254.pdf
    • https://cdn.sqhk.co/wadusazilox/0ghjbIC/farkle_dice_game_rules_printable.pdf
    • https://cdn.sqhk.co/luwiwaduna/NGiiNgc/88783641266.pdf
    • https://cdn-cms.f-static.net/uploads/4527237/normal_5fdc29f30d34d.pdf
    • https://static.s123-cdn-static.com/uploads/4425005/normal_5fe2a46b4852c.pdf
    • https://static.s123-cdn-static.com/uploads/4369328/normal_60081e85a1782.pdf
    • https://cdn.sqhk.co/gukawaki/gc76jeR/bike_racer_3_unblocked.pdf
    • https://cdn.sqhk.co/kuwusemob/kijchgo/visolonos.pdf
    • https://cdn.sqhk.co/xedaberetaj/jjohiM5/2296998851.pdf
    • https://cdn.sqhk.co/xamitarerivu/D8PuhbV/pictures_of_flat_screen_tv_above_fireplace.pdf
    • https://cdn.sqhk.co/tidilotofuka/9gjT0lB/burn_it_down_theme_song_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/61c2329d-1df5-4510-8edb-482eee66eaf7/mifoluravub.pdf
    • https://s3.amazonaws.com/wulotugadag/3405144816.pdf
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_0d78e6402a0048c7b9e312660c8c03ab.pdf?index=true
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_7c70e7a7d58f479dba2c36aca90514b2.pdf?index=true
    • https://s3.amazonaws.com/wizuluworafid/royal_canin_medium_puppy_feeding_guidelines.pdf
    • https://s3.amazonaws.com/vinivuxo/performance_testing_weekly_status_report_template.pdf
    • https://uploads.strikinglycdn.com/files/0ad32cb0-f7b7-4354-8074-d5d0770db0cf/wixajamojijunotudifula.pdf
    • https://s3.amazonaws.com/bakoloj/sunurodebolagizatowemosu.pdf
    • https://uploads.strikinglycdn.com/files/f053113a-4ddd-4825-89b9-f65fadd38d41/xifimakimebosat.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_off00010c36.bin
1b85440f56841d23e4cb19daf0c50411c3835d8950bf1412d36c905c5eb5a674		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C36 5596 bytes
font_01_sfnt_off00011f2d.bin
85e9d0de66119b882e5d9d1f190eb397d3a5f588702c8ea53dde9278ac62b4a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 10356 bytes

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