Malicious PDF — malware analysis report

Static analysis result for SHA-256 11da251028e8da1a…

MALICIOUS

PDF

85.7 KB Created: 2021-09-20 03:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78e9515f7f813a0296e6cd6bf1421b68 SHA-1: 847c87a8a379fb5aa94a91b1210fba7500a3948d SHA-256: 11da251028e8da1af2116c7618a8f17006fb4b85f7dc4c66fbc8ba17b23beb8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable hosting and appear to function as a link farm, a common tactic for phishing or distributing further malware. The presence of external URIs and the ML classification strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://catamma.ru/uplcv?utm_term=retrieve+photos+from+lost+phone PDF link annotation
    • http://ijfbn.com/editor_up/8314905291.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16147a8d215263---9791828389.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/nibuvesemulujuzekosulu.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/masawa.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/difuwozateli.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/rejuraxosekepilufujureji.pdfIn PDF document text
    • http://boldogelet.hu/media/59231553113.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/80503371147.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/99786497281.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/pixubupiwevomejuzatuper.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/83916120184.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///mixamukadazigikiselen.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/50618453517.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/rifujerofosavalatotafi.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/12125919875.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/xaxurotufuvejodoruloga.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/43377766315.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/31582821861.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141dedd9e015---15115693002.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/fitafewa.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83499747258.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_off0000e5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF6 19676 bytes
SHA-256: 115ad1350de561f2332ef59cc585226635522b880de84128dc8b4164591fd967
font_02_sfnt_off000131a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A9 10572 bytes
SHA-256: a696113db20603a3afbc2aa36a1a05aa264e4271c40d2e34a14bf2b54c2c8127

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