Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0601a1eada9ba88…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 04:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 53ee38fe20b939e1dcd0206c9e501efa SHA-1: 640ba2769aeac3f6fc833aa0d9a7d7ab80cc5e83 SHA-256: d0601a1eada9ba888f3d72900afd5a9cf2691a6b6ab8064d8c10be5e39c62b69
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to form a link farm, suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure points to a malicious PDF designed for URL-based redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://khonggianxua.samdigroup.vn/app/webroot/upload/files/26178594940.pdf In PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/5722150435.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/5254238127.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/26487085740.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/60484582916.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210914000118.pdfIn PDF document text
    • http://kaies.cn/upfiles/210905225549782741pykxnt.pdfIn PDF document text
    • http://qdjshg.com/files/file/89306736213.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a90668721ebe80965162d90e71f0d66d/47556645093.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/ripopobagamulipu.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/5136513503.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/wosofovobigudawafumugamu.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/95528524083.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/dotapobipekeboratesajuza.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/rewefikifilarusap.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/30168063809.pdfIn PDF document text
    • http://3sdent.com/upload/files/21143728471.pdfIn PDF document text
    • https://topupdana.com/contents/files/dosowevidetujomafofoke.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/37961986081.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613425e758707---kofurobirudevedipoxe.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/31409118625.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091601564183.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/26184196832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=whatsapp+para+pc+sin+emuladorPDF 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_off0000e29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29F 17932 bytes
SHA-256: 5fed69dd10e79bc97b068e09b5bb30e6ba1bfc878a7d224c10e21112e7c9ab6f
font_01_sfnt_off00011181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12998 10872 bytes
SHA-256: c11a0f5d9728d2bc95946cb2485bbc6a6954128d793f1b5003c140dd3de36b4f