Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1307edbfa1c3327…

MALICIOUS

PDF

85.4 KB Created: 2021-09-21 09:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6b78541c764de4adfc7401a4fdc47964 SHA-1: 43271ca31bf82566a7914623528ff7a46640796c SHA-256: d1307edbfa1c332759cc5b28048f5c1b811958ef4663aae7b2b67597bd6a6eab
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded links, many pointing to unknown domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying a link farm on disposable hosting, a common tactic for evading detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://portofcrotone.com/dati/upload/file/53098508979.pdf In PDF document text
    • https://lecachet.fr/docs/files/15156934129.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/vizarulilegigo.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/anvkn67a6ddm3ta2egiplgc547/zusitipekuzovugagub.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/27257218349.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/visozurezugudopewamejaf.pdfIn PDF document text
    • https://raljob.com/userfiles/file/kepowakib.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/22623010412.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/a114a9d54dddf82e206a305b19a870ee.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/kifumu.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/biwefajisazubulor.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/30605267968.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/femudodafisulumokofikive.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/puwesavixezafituliw.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/44518614637.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/finikaxunojunetinor.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/ec93a7de33155638233d553c5bba4f99/gevenuw.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/95516882739.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/foroxisodafokewuworat.pdfIn PDF document text
    • http://grimastone.ru/files/57007558589.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/73645897044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+open+perfetto+trace+filePDF 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_off0000e687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE687 18964 bytes
SHA-256: 66a97866689064d72a4a873766faf30e2ff11f2e86c68839e19a3c9966a2ac85
font_01_sfnt_off0001184b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184B 10380 bytes
SHA-256: a97b931680d9dc03a0fd0957adaf2264ca3f7d528a4a429d8df605009c8332fe
font_02_sfnt_off00012fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1