Malicious PDF — malware analysis report

Static analysis result for SHA-256 cddea8efbd4851d2…

MALICIOUS

PDF

80.3 KB Created: 2021-04-04 13:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0338e0e8fc05ffda0419f8191a2091fb SHA-1: ad42f0ac1c10fa87b69964afac13e6ce76b95d59 SHA-256: cddea8efbd4851d2c750608f4d9c91887a95f83747d425bbe7693aeca07d29e7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/123?utm_term=hyponatremia+management+guidelines+uk
    • https://rebadezoj.weebly.com/uploads/1/3/6/0/136027304/7706022.pdf
    • https://ronupajowosoza.weebly.com/uploads/1/3/4/8/134871490/fokoxe-vezatewujur.pdf
    • http://mavito.online/vepopevijenapikapegae98y5.pdf
    • http://clientbluebadge.com/19282612418woj53.pdf
    • https://senevabitup.weebly.com/uploads/1/3/4/2/134234896/1531de42533.pdf
    • http://onlyforyou.space/bogojoko9545v.pdf
    • http://erethiztzj.space/doubt_a_parable_essayyo1mj.pdf
    • http://fadewujetenuve.mywebcommunity.org/robulukofibozowitaneron.pdf
    • http://fly-drive.online/brute_electric_start_lawn_mower_reviews6vuq9.pdf
    • http://muzhskoizhurnal.ru/33447924774o4k9e.pdf
    • http://leopolds.space/almanca_renmeklztao.pdf
    • http://tubujek.iblogger.org/2303156831.pdf
    • http://xekaleduwam.iblogger.org/aol_mail_mobile_app_android.pdf
    • http://csxmoney.info/rome_total_war_barbarian_invasion_android_reviewtjo28.pdf
    • http://kopalirigel.mypressonline.com/zadanu.pdf
    • http://italysummer.space/xemowanexirididasabomald7eqs.pdf
    • https://vijipivefewari.weebly.com/uploads/1/3/4/6/134624644/sekejufuweko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bopewexe.onlinewebshop.net/the_adventures_of_huckleberry_finn_full_text.pdf
    • https://uploads.strikinglycdn.com/files/cbcd4512-892d-464f-9149-3d80e2ad2a26/37981774812.pdf
    • https://uploads.strikinglycdn.com/files/b8b87d83-f2ca-4324-a136-d7c5ddd0bcf6/genie_pro_screw_drive_compatible_remotes.pdf
    • http://jemuxopirale.rf.gd/vekeji.pdf
    • https://uploads.strikinglycdn.com/files/ab7f5d6b-45d9-4666-9a89-743f12eeca03/dunkin_donuts_secret_menu_iced_coffee.pdf
    • http://kipixuge.epizy.com/lodisasefawim.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3aa.bin
b38c2ef562ea39a3d728e0355c0d0d0de94786bd2068de33205817ab241c2a6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AA 5408 bytes
font_01_sfnt_off0000f5ff.bin
1616168b225f2f70dd97d7582ea756fa49c584f6915f0d3244f580b80fd5ec93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FF 12116 bytes
font_02_sfnt_off00011e70.bin
e70435e2641b3aae6193dfd4edc7942d3948bcb9f116085093c9cc1444ae4351		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E70 16100 bytes

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