Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e23da29ae2a613…

MALICIOUS

PDF

72.3 KB Created: 2021-09-29 00:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bfe8bb643e8af17ad115e060079d8b23 SHA-1: 2160735cb22ca4109074fbf8cfaca636adc28ad9 SHA-256: b3e23da29ae2a613a4d5eb45ea775aba45dc1554e3d12fbbb6a37bbeb2d9df3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious or unknown domains, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing campaigns that often leverage embedded links to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://bitree.net/ckfinder/userfiles/files/88514244615.pdf In PDF document text
    • https://zoorichi.com/temp/fckeditor/file/mutuwutori.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/76524888079.pdfIn PDF document text
    • http://texmet.pl/userimages/file/jonebapilojipejatojaf.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/38055854519.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/pinunubuzogawowotopafaz.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/dezagogikakepiwux.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/zanepaziluxajup.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/xawovimuwujabaz.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/jiruwozilejujujebos.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/womoref.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16136cdfb65fe6---zoxotetimufekejodadotaf.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/cbcaf0c0931506ac594cd62342158692/15689902460.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/kigelo.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/97503435449.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/gerevikedekalewad.pdfIn PDF document text
    • https://angkagenap.com/contents/files/78597132233.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/bironev.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/gewirit.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/dofeboxajago.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/figipu.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210902075154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mast+pro+apk+downloadPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/69727290684.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_off0000b59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59E 18172 bytes
SHA-256: 34a70eeb7b9e03dda7848c3a16d120609682c1e9e8bcff9953436a375f19ef07
font_01_sfnt_off0000e482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 10332 bytes
SHA-256: 3b13557c548863a41a76336e72d3cc607078c12cbd3a8a6cc051ab463acd16ab
font_02_sfnt_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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