Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b30622ba2be6c00…

MALICIOUS

PDF

71.8 KB Created: 2021-09-25 04:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e54ad6000642fe582ac2604b14e467cd SHA-1: 677c8f7e080278b4cec7d729c359540218854b7c SHA-256: 1b30622ba2be6c00dcf82d6eb5804f9331c483b362e3b817d81c84e31579aa13
126 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to suspicious domains and are structured as a link farm, suggesting an attempt to lure users to malicious websites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

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 https://nomaquito-travel.com/editor-images/66516974699.pdf In PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/jidizutovelujikarip.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/vaxetuvugesowumuxut.pdfIn PDF document text
    • https://endobible.com/userfiles/file/73965137248.pdfIn PDF document text
    • http://sdds.be/userfiles/file/webifukuvexe.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/sametagawefosamotakixot.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/96710024109.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/ravukizabupazazulur.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/rakuvej.pdfIn PDF document text
    • http://ned.ru/uploads/files/vebeliwumifokavulaxe.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/64682096307.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090623384771.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/91401337572.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/wevokefeniti.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/nixibomofepezusolowin.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/bekitujisoluvolam.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/zuwanetefodekukobivuz.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/92232840599.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/53057281603.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300bd2b3876---56016459988.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/73765785883.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/34269705628.pdfIn PDF document text
    • https://hoalavender.net/upload/files/16119465656.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/rinusalarumabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=latest+update+for+samsung+galaxy+s5PDF 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_off0000b497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB497 11156 bytes
SHA-256: 6d4ae38a3f17ca8ec97fad5fade986eb559de3b8b0c043e7d2c8db6b557d10ec
font_01_sfnt_off0000ce8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A0 16680 bytes
SHA-256: da24093c97f0c385a93c60ffd3cce13dd2d1529babdf74c1ec741c185c003468