Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2760e0cb6238cf…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 19:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b7776badf0cc615f3813d06bd804c4e SHA-1: a5321fe0f81184c0ca40d3eff36307d44de3dfbe SHA-256: 9a2760e0cb6238cf58f177ce62fea5f07a45c9703853a05b1b68e92043893b4c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure indicate a likely attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cdmsig1.com/ckfinder/userfiles/files/nagijukujufiluxugexolom.pdf In PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/59739780195.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/30683705683.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/47599212334.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/48739557961.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/fulifowex.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090323552273499.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/80698062566.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/xejeva.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613de7f608a0d---29906230461.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/3502754906.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/92981976083.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/rokigeti.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/sadagudonizotozoxoledefek.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/12065516185.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/70473889529.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/noxupuzoguzibawuriruke.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/72559610527.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/53439503613.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/bufusanomobu.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/muvivob.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/sesogosowojiz.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4781dc2a6---85961010843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=world%27s+worst+pick+up+linesPDF 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_off0000b10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10D 10652 bytes
SHA-256: 9ec0fd3e615c048f7b43739de42f52afe69868d45592c9549f65554a27c78591
font_01_sfnt_off0000c9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A2 14812 bytes
SHA-256: 9b2b648b4f28868def524f74f96260062c3a5db0e1f1a6c1d9738d45970de73e
font_02_sfnt_off0000eedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1