Malicious PDF — malware analysis report

Static analysis result for SHA-256 946ad43b96d7b719…

MALICIOUS

PDF

81.2 KB Created: 2021-10-07 14:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1e4d006894b6660ac91b8c4bb2b399a5 SHA-1: 979e9f025f381f591efbbec79421aa3a2e2e37d6 SHA-256: 946ad43b96d7b719c9683cb84d0e58331a0eb2043f7f817ca0ad67269a21a965
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of a 'link farm' heuristic and numerous embedded URLs, many pointing to unknown or potentially malicious domains, suggests the document's primary purpose is to redirect users to external sites. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://marketingnews.fr/images/file/riliwasiripu.pdf In PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16144567884a46---paxoxodadukezubetu.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/natoturosikaginatovubes.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/89586190318.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/33621775446.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/jalebe.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/51179578503.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/924107947.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/nofubowatenukib.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/kuzakewanipoz.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614595742e912---38801086434.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/bevikobuburaraxunew.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/jevul.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/3186652587.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/wamadovijewexinakuzux.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/risanemudikavazoxofafune.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/pixenomuriluf.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/luzoxibefatawobemovo.pdfIn PDF document text
    • http://carbonelite.ru/file/18595222500.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/sajizelaxogoxitaxisokabi.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/zujopapavowoked.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/jusununuxamege.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/84544165324.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/58851228552.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/32733394645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=canker+sore+upper+mouthPDF 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_off0000d73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73B 10600 bytes
SHA-256: f8eddaca691f383ae0f762a15b70cf7f6283e68f65d4d2076ba2bc2f43ddd591
font_01_sfnt_off0000ef50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 18596 bytes
SHA-256: 63cc113108d648a09e46cfa8c01408ae831f4e4f22dc4abea1a8fc4d9b6509e6
font_02_sfnt_off00011f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1