Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a8ac1dacff943d…

MALICIOUS

PDF

82.7 KB Created: 2021-09-21 19:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d636dc3cbb3611020c2bc05e7449bf93 SHA-1: ff8c620b07844c91d0fea0d8951cd272bd349d88 SHA-256: 72a8ac1dacff943d5df83635f558dd9d154755d5262171a8165afa04d7899d6d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=apk+downloader+ios PDF link annotation
    • http://aytekinpolatel.com/image/files/nafotamozisivinibemusasuv.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/bozadetolulowavokix.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/45018076371.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/80840657591.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/gejarokekilosumaxekip.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613f9de18b991---lanixipakix.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/22937475278.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/99282876191.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/30026170453.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/zafoxomuputi.pdfIn PDF document text
    • https://grouptm2.com/contents/files/dolada.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/fepunutaneximolu.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/82467641087.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/gagimijijovikimibosirot.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/novutedalotez.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/28514934744.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/33816923798.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/5686093934.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/57582148569.pdfIn PDF document text
    • https://chptravel.ir/data/file/mufuzubizawa.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/towuzoka.pdfIn PDF document text
    • http://koutingchina.com/upload/files/30370933152.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161337a2059581---sepefeginog.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10A 10444 bytes
SHA-256: 13fcde00a88aa3d53e4813df5d388f5d4180edba4a691a50f7f9598b4a979e71
font_01_sfnt_off0000f8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 17128 bytes
SHA-256: 6a5f567a5637b9b80c501655e3243cccf165a618a546196331c69b1d0877c402
font_02_sfnt_off00012550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1