Malicious PDF — malware analysis report

Static analysis result for SHA-256 d184a2d084e5bdde…

MALICIOUS

PDF

86.2 KB Created: 2021-09-18 18:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 972c754dd3d34caa34d436ff183e93f7 SHA-1: dbd0c3140c5e12c8f5ec3fe3242b1b4c84cb6f00 SHA-256: d184a2d084e5bddea5419442ea70e8edec01657743d89579fb40f652fa9ee58b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to PDF files on potentially disposable domains, suggests a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://sieuthimaycafe.vn/uploads/file/xefejaz.pdf In PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/32621516194.pdfIn PDF document text
    • http://bakoca.hu/files/file/81942043422.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bh5ah42jpt97ojc7dfepfouc72/40045712153.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/rufize.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/pimusutix.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/73702930985.pdfIn PDF document text
    • http://honghuibio.com/d/files/77904424622.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/29626068794.pdfIn PDF document text
    • http://freeorden.com/media/file/54906933064.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/gijipazuwexofepoxifafipal.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/36551431097.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210902184626_gnypdx.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/redaje.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/fuxawezorajiboxugos.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/xupusuwo.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/wufegupetutadikuxegavof.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/manusutuzedeb.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/bafaked.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/jivakomijogufofob.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/govizuwivasadewemunakov.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/wojap.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/zuxul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=beste+fotobearbeitung+app+androidPDF 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_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 10920 bytes
SHA-256: 7b1ba7009c2a1b377e1319e2bc50518465581cb8995fc378824de794c54b94bc
font_01_sfnt_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3C 18220 bytes
SHA-256: e27213b47b2760c0644da9be28d6163ee22c726d6526a1759a79707b28d464f2

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