Malicious PDF — malware analysis report

Static analysis result for SHA-256 071641a9a6b5452f…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 20:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 73a414e6ebf110f482444f0b0842d713 SHA-1: ba6740daded9721689ebbf9c4af12e493f1587e9 SHA-256: 071641a9a6b5452f2525f012739e4e8c1ee8a0bb62db7d800ff0e9f6d9c82a63
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests the document's purpose is to trick users into downloading an encrypted archive, a common tactic to hide malware from initial scans. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/35280726977.pdf In PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/49394059793.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/daloli.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/84842835654.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/66692768343.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/sozaguxuravegabazefumu.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/42167500901.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/42146190734.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/94713927092.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109020126053561.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/derozigatoderetena.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/lewovoxoxibovaweta.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109011223367231.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/72065085628.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/79955976374.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/tisutoviwaviloj.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/mazow.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/16307194312061875431.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/xopon.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/23856284062.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/xepubonof.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16142ffc15dc06---nibinumanujavab.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/9910356566.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/32547710218.pdfIn PDF document text
    • http://micruts.org/userfiles/file/begotolidoxofikudavebun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+open+password+protected+zip+file+without+password+in+androidPDF 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_off0000d189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A0 10956 bytes
SHA-256: 73380434b70318bc24eb149d077b0201d491243046e862ecb9bd1a01b122ea13
font_02_sfnt_off00010305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10305 17508 bytes
SHA-256: 6db2c29c37e57a9ead3905bfe41adf2dc9c9ff7345a736a94481c4183a194c84