Malicious PDF — malware analysis report

Static analysis result for SHA-256 39af78c6448cf0ee…

MALICIOUS

PDF

85.5 KB Created: 2021-09-09 09:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7baba7163e1c9c787cf6d806e603788c SHA-1: 0363bb25631c51c3bee1b1e20f3d7c13037be661 SHA-256: 39af78c6448cf0eed7b4d6a20ef1ec00b4e95190cf8de81c8c7f6b2f898e425d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to download further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://psn-monolit.ru/img_file/files/62937895539.pdf In PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/6148472473.pdfIn PDF document text
    • https://kapefashion.com/files/files/ginivonutidawivesibezuset.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/56589107277.pdfIn PDF document text
    • http://specimport.by/files/files/babanekamopowuto.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/devilirizosugijejevinuri.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cf6477df5---jojipu.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/savizigexikevon.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/diwoxewerujujabex.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/8737006212.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/kewabemuvodav.pdfIn PDF document text
    • http://pk.mo/userfiles/file/76783759782.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/90996466586.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/rurododa.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/dituvaminuloko.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/degizeligelaputakuvifi.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/82672238382.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/63542133527.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/47776135989.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/zadafibofuxodebifa.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/jovopugogubul.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/77871990244.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/wotuvozifav.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb8fa1f420---27767265224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=download+games+harvest+moon+apkPDF 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_off0000e5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E3 10992 bytes
SHA-256: 31e5b45ec320e5e94acb8252d6df817a27782bb297466f8c232ddc1265c88673
font_01_sfnt_off0000ff1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1A 18668 bytes
SHA-256: cf0ab954d05809f704e9254b23301649f8127245c6f351350a3afbe0e4e92e28
font_02_sfnt_off00013001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1