Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd86c50f522bf70…

MALICIOUS

PDF

74.4 KB Created: 2021-09-17 13:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1c1f10786f9787f5e972594ee7958522 SHA-1: ab419ce5797f81ac80d74c24b98274a2b640873b SHA-256: ddd86c50f522bf70c9b926ba34675d6c671bd9bd0b62f99d7b5ae3d3c33a4973
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a link farm on disposable hosting. The embedded URLs, particularly the one mentioning 'gta san andreas apk pc', suggest a lure to download potentially unwanted or malicious software. No scripts were extracted, but the PDF structure and URL analysis indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://a-aqua.fr/ressource/site-image/files/vodovunerodolud.pdf In PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6ba7ce940---51505554585.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/60856273968.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/66620760371.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/33858906563.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/98275334406.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109101745103208.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/tamere.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/geberev.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/zevegemitexivujojufalu.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/xulanetajovavajo.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/gavuruzuladodozutob.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/xosizugonuvisili.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/39009694545.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/libimurafufagebuledesenir.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/91949771761.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/42525342444.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/36489942670.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/dulokakirara.pdfIn PDF document text
    • http://ned.ru/uploads/files/kudowip.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/37557459436.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/merugokiranipotav.pdfIn PDF document text
    • http://geose.ru/userfiles/file/4697526183.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/79825117229.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/nopugubuxujafaziforewired.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/turabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=gta+san+andreas+apk+pcPDF 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_off0000bb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB48 19028 bytes
SHA-256: 32781624b2175ca58b3c8ae5890fbae9ea48081fb9ced0c125ed231ffd821c32
font_01_sfnt_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 10380 bytes
SHA-256: 8269afc7b16d8f0c2448663065916e99fdcfa85d09b8523a6e0969b35a4455f0
font_02_sfnt_off000103c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1