Malicious PDF — malware analysis report

Static analysis result for SHA-256 aacc5a6c15a89245…

MALICIOUS

PDF

87.3 KB Created: 2021-10-05 00:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b5e790c7565bc15482c05836d06282b4 SHA-1: 92ea8bc96b285002530c729f81e584463ace9d01 SHA-256: aacc5a6c15a892457a89e1df1d2386b49063b48c59be1747f2515562f35b7d27
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://shqinze.net/admin/upimg/file///85865616935.pdf In PDF document text
    • http://pankajplast.com/ckfinder/userfiles/files/nosodemasukedaxejanevuw.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/nowunubofa.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/xinezanawujom.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109201446196664.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/8290554302.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/4321281878.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/lurokibafepikaborubinano.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/vubovivenulole.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/kotobupakogujopupe.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/57277730979.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/39642904513.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/65483000188.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/56026627726.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210920125738.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/suziruluvuvilesemurox.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/degokidugolisuzipisotu.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/fesevobarol.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/tidedafulexugijeneru.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/36393837118.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/torokejapinome.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/58464660897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=jersey+shore+all+episodesPDF link annotation
    • 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_off0000f1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CF 18256 bytes
SHA-256: d885260eb5e85a56d8ef233fd39103c098477f5efe71c3c3ef4b18180a48cebb
font_01_sfnt_off00012008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001381f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381F 10392 bytes
SHA-256: c535137bb660e2b073a2542dfacdd8d44aeee9d47826b364f218c836c8f94e0b

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