Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba673e82553346e…

MALICIOUS

PDF

86.6 KB Created: 2021-09-19 21:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ed160fdf715027a67ac2b34544176b61 SHA-1: 1005dcc7c748b2a152e5841d008f8abf8ebd6ae0 SHA-256: 7ba673e82553346eb4b85a05daea26f2bd7c29a6f46de8fc3aeeb1f493c2fd02
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs and a link farm heuristic suggests the document is designed to redirect users to external sites. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://superpackeg.com/userfiles/file/tejurakonalotexo.pdf In PDF document text
    • https://okazdedziecko.pl/_files/Media/file/miwuniwibiroxiva.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/2fa72d6cd8901ebcc27193b72cf80cf6/tefafobe.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/57000949747.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/9369043496.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/fuvineperigogab.pdfIn PDF document text
    • https://ptogel2.com/contents/files/rodatowavodudukesivupibak.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/tibaxineleditunobululeji.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/fevawojujigek.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/kupikuturelapi.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/vafanaruvijaguluvi.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/50646887296.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/50ab4b754ff1ca1283a2891ddb50680d/17100823205.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/bukodutomuwiwom.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/64624512833.pdfIn PDF document text
    • http://synergyproperty.com/images/files/gijewupapuka.pdfIn PDF document text
    • http://tid.vn/upload/files/49492778616.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/18871165985.pdfIn PDF document text
    • https://rapn.ru/ckfinder/userfiles/files/54115825267.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/42959393880.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/74313427384.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/soxolorisil.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/jimilugefef.pdfIn PDF document text
    • https://12waktu.com/contents/files/sonevusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=best+robocall+blocker+app+for+android+2020PDF 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_off0000ea6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6A 18232 bytes
SHA-256: 7867e21a1fe2f5f348c291072039b1ad5a4418e0d64848677068ac07470c4ceb
font_01_sfnt_off00011a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A73 11140 bytes
SHA-256: ee5e44f6b73c604574877d403c3fb7b48087e1ce78b0d96e20b757b222328c09
font_02_sfnt_off00013473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1