Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cca907723908f3b…

MALICIOUS

PDF

84.9 KB Created: 2021-10-12 02:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5cbf0ee16d5891f308ab1f52603ed634 SHA-1: ec0a47f51c08835f0a583c1303e793539e330960 SHA-256: 6cca907723908f3b0b0e59c4ba60102c2f939cddec59c4d6bead3199692bc2d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous external URLs are embedded, many pointing to other PDF files, suggesting a distribution or phishing campaign. While no scripts were explicitly extracted, the nature of the embedded links and the 'link farm' heuristic suggest an attempt to direct users to malicious content, potentially as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dataprint.ie/uploads/file/jefaluposidije.pdf In PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/16263069455.pdfIn PDF document text
    • http://klpa.net/userData/board/file/6634800093.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/rovabad.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/wufagemudus.pdfIn PDF document text
    • http://sciattella.net/images/file/wunexubepumusarilukefas.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/63440364171.pdfIn PDF document text
    • http://abworder.com/uploads/files/13075067102.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/45727148910.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/58511624288.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/qgspkujnhf5ot01nbcqmq0k1ep/68755368082.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/7301008633.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/tajov.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/49054405373.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/53613336808.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/buluzaraxabinikifisezizex.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/buwidunirurigiri.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/xifawego.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/72666624103.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/dasexokuk.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/70222338720.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/5921407644.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/96899982033.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/tgwjJlsMqHc/uplcv?utm_term=black+panther+full+movie+free+download+in+tamilPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/611db7fe53eb9fd3c1c276e922c62554/suzawifibofebawigadir.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_off0000e44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5F 18396 bytes
SHA-256: 0bfa7e8e15dabcf543e102c4b85751ccf284dc7c198a6e6d85f6c7f31694382a
font_02_sfnt_off00012ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA1 11112 bytes
SHA-256: 854e5d0d64dbdf0fd10a309c3564fa487bba2a72d481e6e276be77b729076606