Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca550e83917db99b…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 03:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab79d0dfe661ecde8031ad4f5bf8e812 SHA-1: 17c4944f19fceed7159c410cd70db0889802ee8e SHA-256: ca550e83917db99b07d43182c7ad6a18005670fd0533b0b47a874784d0adc8b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://pistant.ru/uplcv?utm_term=super+bear+game PDF link annotation
    • http://tsrmvolontari.it/userfiles/files/xelazevinenij.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/37674576920.pdfIn PDF document text
    • http://sns.hu/_user/file/gubox.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/49114215336.pdfIn PDF document text
    • http://alefart.ru/admin/ckfinder/userfiles/files/72641106087.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/7035266856.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/bobanow.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/rulipokena.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/lelewafajozad.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/72108415347.pdfIn PDF document text
    • http://dsfly.com/uploads/files/82560620546.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/43708494452.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/vofetiwafiju.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb6484100e---mabinajun.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/12455528690.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/buteguzirofa.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109071224056357.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/melowiritapukikafep.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-24/20210924172951749564.pdfIn PDF document text
    • http://kunbot.com/upload/files/90470138294.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/pinobo.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/fupotejotavikejewe.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_off0000ac5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC5B 10280 bytes
SHA-256: 4a0bb996daaf355c745e8b5c0449be2784c68486401c20546dbca390c807dfe2
font_01_sfnt_off0000c347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC347 16756 bytes
SHA-256: 6e2f7342a08e2ac4b4c1216db2a5eddf1d5cdb84fa2d3fbad659114f872f9654
font_02_sfnt_off0000ee01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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