Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef65e36f54b7ec4…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 10:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 266d79147629a3b3db2bc6a24cc72b3f SHA-1: 672970324e832f4947fbc97209a26394f2f7679d SHA-256: cef65e36f54b7ec47b44c790e1096451d998359700e165f84344ff95830b1cb6
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf163b1ec---37814974742.pdf In PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/64559899737.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/suzisonivobobotata.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/28314016645.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210906105706300527.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/kavuzawerewomefudujafu.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/xezokalufenudivodas.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/nevagevixasurasuwuduzup.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/87821292781.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/98706282.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/bafuvim.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/dazunafi.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/zodolidasetufupeze.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/14353460036.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/xunazokibef.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/jeloxusobugoxo.pdfIn PDF document text
    • http://geoman.cz/data/file/38696640196.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/83339327489.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/jamidodubija.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/putigulelimomosarigafobu.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/56849941015.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161328e426e5fc---8089059414.pdfIn PDF document text
    • https://artenika.pl/fck/file/12718655056.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/boval.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=heart+and+soul+kadir+nelson+pdfPDF 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_off0000d64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64B 17444 bytes
SHA-256: f57ac26753bfe6a26a58a93fbaf36262e29ff522268bf0dd4ba6aefeb959cc95
font_01_sfnt_off000103d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 10672 bytes
SHA-256: 8eb5ab299bb2cbade63344c0cac66cfa294246c5222becb385764f438ceec2eb
font_02_sfnt_off00011c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1