Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61080d5cc115493…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 21:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 66d6c8911e1f873edff290c2fca082b9 SHA-1: f03769de91f39bcd1fd8595d801dec0bd5a5d9fd SHA-256: c61080d5cc115493f15b54328089904cf1aa4268195964a0f3987342bd632308
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including a direct link to an IP address and a link farm heuristic. The ML classifier and ClamAV detection strongly suggest maliciousness. The embedded URL points to a raw IP address, which is a common tactic for hosting phishing or malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://211.129.1.225/system/ckfinder/userfiles/files/latufofegabomubabena.pdf PDF link annotation
    • https://laptoptranganh.com/data/dulieu/files/73602543200.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/xegukekegejulobali.pdfIn PDF document text
    • https://magatek.com/documents/file/moxanumutiwig.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/73471107017.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/47066621621.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/pedusutapumaxijifelimitan.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/pabarewofakuxomo.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xupamanavuzuvoxofisov.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/jutafivuwadadup.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/memixewudalu.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/velizasikoz.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/budotivuvipozoxibaxoje.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/40732158435.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77959692990.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/sidijumusigebipakepesep.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/sejazi.pdfIn PDF document text
    • https://motecx.com/images/file/41537976519.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e76b8671a4---sigixegaruzudezugu.pdfIn PDF document text
    • http://sudeoksa.com/userfiles/file/20210912085629.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/17379908708.pdfIn PDF document text
    • https://tuyendung.vinaonegroup.net/upload/files/26054310574.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/21525452512.pdfIn PDF document text
    • http://salespate.com/userfiles/file/fejinuvemuworufav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=srb+surgery+latest+edition+pdfPDF 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_off0000afc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC1 16200 bytes
SHA-256: b046a8be58133151b5b4307241da0b622ae4493cfc629e4e3fccafafa160b536
font_01_sfnt_off0000d8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 11100 bytes
SHA-256: 985b21f792ced08e9d3100078b07d24e6386f103ffc4c1489035b9ed1d242f08