Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8878b58ab8ffa3…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 16:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9223202200ec84b0efa4140e02a209dd SHA-1: d7e6ca5fd5dff0c13c1c5429df8e52cdabe8f9ca SHA-256: eb8878b58ab8ffa34b26f3ac3933617e06107920bad5e462e7c21a6d3ac413cc
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF phishing trojan by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm on disposable hosting and employs a callback lure, prompting users to contact a number for fake issues. While no scripts were explicitly extracted, the PDF structure and associated URLs suggest it is designed to redirect users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://smidgel.ru/uplcv?utm_term=st+francis+xavier+easter+mass+schedule PDF link annotation
    • https://dawnraytech.985.tw/data/file/userfiles/files/ponabividawapeginipe.pdfIn PDF document text
    • http://1carl.com/userfiles/file/12720055694.pdfIn PDF document text
    • http://devison-matras.com/upload/file/72296210692.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/zunur.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/sideworoxove.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/28453135644.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/tuxunatapasotamesiz.pdfIn PDF document text
    • https://casaalu.com/luutru/files/vubekefomuresireji.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/61205657190.pdfIn PDF document text
    • http://cataga.de/beta/files/file/wuvuwozime.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/bepirazotekogajib.pdfIn PDF document text
    • https://dptech.vn/uploads/files/ropegusuweriwoneripesej.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/worer.pdfIn PDF document text
    • http://sinners-party.de/media/file/70207741795.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/rodivesodononajudutaza.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/rutekeziv.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/robejotadofojotemokiw.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/bifimoga.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/57087801874.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/zipatiniwaximeno.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/66362828017.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-09/images/files/jopavogovelejaj.pdfIn PDF document text
    • http://email-database.info/userfiles/file/28390555580.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/071021285633.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/bofipoletusif.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/87664198476.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_off0000d146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD146 10964 bytes
SHA-256: 51f46bc7058183f8f8529abb8b592b662fffab8fd5ad29fe6a80486a3fdecb97
font_01_sfnt_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10298 18544 bytes
SHA-256: b23d3a941e119191fb3605071fdf7733268b2c266012f4ae28fdfb3bb067b254