Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fee41447de3d2c…

MALICIOUS

PDF

85.5 KB Created: 2021-04-23 10:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 29117b91daa708da6e03eee1747691b1 SHA-1: 39e8716420b6642ee2f8dfa4edc1bb4cf50ea3b9 SHA-256: 81fee41447de3d2c534b1c521ad263622eedb07bf2f71f612c1767bd82683ddc
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous embedded URLs, many pointing to disposable hosting or suspicious domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • 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://botokaw.ru/strik?utm_term=comptine+d%2527un+autre+%25C3%25A9t%25C3%25A9+from+amelie PDF link annotation
    • https://gulipuzajetag.weebly.com/uploads/1/3/5/3/135397689/dimedurej.pdfIn PDF document text
    • https://pinipinemijik.weebly.com/uploads/1/3/0/8/130814728/veziputazaxu.pdfIn PDF document text
    • http://remontvorot24.com/97759924115p94nx.pdfIn PDF document text
    • http://rebelliona.online/63484023115dd4kz.pdfIn PDF document text
    • http://surevixa.22web.org/27285991770.pdfIn PDF document text
    • https://xuwulusepe.weebly.com/uploads/1/3/5/3/135310973/lupazarirama-xorilasid-mosot.pdfIn PDF document text
    • https://mepifinifiwiza.weebly.com/uploads/1/3/4/3/134334375/3254103.pdfIn PDF document text
    • https://cdn.sqhk.co/koletexun/Yjetwgj/undertale_chara_wallpaper_hd.pdfIn PDF document text
    • http://flebolog24.com/81900116919llbxd.pdfIn PDF document text
    • https://cdn.sqhk.co/kulamogo/iaiggd3/topup_digi_100.pdfIn PDF document text
    • http://lasugegaguma.iblogger.org/13001030685.pdfIn PDF document text
    • http://bitsracing.net/what_are_all_the_elements_of_designmfnsu.pdfIn PDF document text
    • http://totalcreditreport.info/80935928064co70x.pdfIn PDF document text
    • http://kokilubowo.22web.org/30893648305.pdfIn PDF document text
    • https://cdn.sqhk.co/xonudutixova/jLkdhev/47779335471.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/93bf0810-09a1-480c-9419-c3919b02dd23/vokexatitamasobojirawigu.pdfIn PDF document text
    • http://lazunebenak.epizy.com/dewalt_dcd771c2_vs_dcd708c2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d06995f-082a-4377-a7ac-ed4291517666/how_to_open_sentry_1250_safe_with_combination.pdfIn PDF document text
    • http://peforiroli.epizy.com/zavubi.pdfIn PDF document text
    • http://tukakuze.epizy.com/20506818163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f30fb56-ac75-4ef7-bbd1-e484d5831944/why_do_atoms_join_together_in_compounds.pdfIn PDF document text
    • http://nibafef.rf.gd/zejeketadugoril.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92b20ec5-ad41-4439-87e9-1d9fcd00fd0c/14021393830.pdfIn PDF document text
    • http://xegikaxobowo.epizy.com/kameno.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54A 3168 bytes
SHA-256: 9e655e96ef7168198876032d4de169a14320469061aaae1332295a3f3491a1db
font_01_sfnt_off0000f087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 5092 bytes
SHA-256: 58d450466bbe37a571b2b17c2f1cfe707834aec1b7a9597fcdb705b2c1d8eb54
font_02_sfnt_off00010182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10182 15832 bytes
SHA-256: f8cd30dd4794c530919462e472c05cd2f2875b2fb1d5a73369a18c6835b4397f
font_03_sfnt_off00012ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF1 16224 bytes
SHA-256: 294ee346f6eb3043e0955212b7988a6b8b5c341275c33edaa0d357d442e81510