Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5c97c5e1497ec9…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 02:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 508e66dac89fbdba2c20167ff6dc3b6e SHA-1: b5ed53f4d1f1b6512c39a7fc5d3aeea791596c72 SHA-256: 0c5c97c5e1497ec9d86a5a695f49c04551e2eee82fe635ef63617b67b3bc65b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The presence of embedded JavaScript, though not directly executable in this context, suggests a potential for more complex malicious behavior if the PDF were to be exploited.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://coretry.ru/uplcv?utm_term=video+teleprompter+app+android PDF link annotation
    • http://pho32shabu.com/uploads/files/9409940004.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/1723624069.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/6657063022.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/34466056670.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/bilumugalamaxizoresona.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/11050529285.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/kigurugusikuto.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/jorunibolivoni.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/luxopozuvarelisuxijajo.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/27281979643.pdfIn PDF document text
    • https://superlitefan.com/uploads/files/45210646727.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451ad074044---82006587688.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/kutikupawixi.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/22465133781.pdfIn PDF document text
    • http://boldogelet.hu/media/nujogowab.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/xowivakemazexatifileva.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/talirutefaredemazebewija.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/91954817608.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/gedewusitusonefito.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/janumififosov.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/gejewamom.pdfIn PDF document text
    • 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_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 17332 bytes
SHA-256: 687cf589d35318465894dc29da0a2c644068f08fbfea5f30e11e10449283e8ca
font_01_sfnt_off000113e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFA 10356 bytes
SHA-256: b9187df7ef7c0c3e349ff5410ead59ac09d49eb8e90f82bd9313efa7153438f8

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