Malicious PDF — malware analysis report

Static analysis result for SHA-256 996860a8136a8fea…

MALICIOUS

PDF

78.3 KB Created: 2021-01-17 06:54:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 02bab5dce3c6f9976c3e6c6c7e99ea07 SHA-1: 7338a5dcb0fb0f2a4e7f227a97e7a05b38e7129a SHA-256: 996860a8136a8fea6b578f1751effd045f5997e80d156eda99d21ac84a26f82a
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier strongly indicates maliciousness, and the presence of a 'download button' heuristic further supports a deceptive lure. While no scripts were explicitly extracted, the PDF structure and URL distribution are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/aws?utm_term=astrology+software+in+bengali+full PDF link annotation
    • https://cdn.sqhk.co/gonolesuzam/B1Djfia/shia_islamic_calendar_2020_melbourne.pdfIn PDF document text
    • https://cdn.sqhk.co/jemajujo/jhMicgg/minokutudo.pdfIn PDF document text
    • https://wufikasuruxur.weebly.com/uploads/1/3/1/6/131636700/fea3df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425484/normal_5ff4852ba8720.pdfIn PDF document text
    • https://pesonukakevu.weebly.com/uploads/1/3/4/8/134863065/ropagu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f9f569a3e8cc.pdfIn PDF document text
    • https://site-1174461.mozfiles.com/files/1174461/dozolugusimenorebofotara.pdfIn PDF document text
    • https://rotolakudezi.weebly.com/uploads/1/3/4/0/134041133/5007314.pdfIn PDF document text
    • https://site-1177663.mozfiles.com/files/1177663/golf_my_way_grip.pdfIn PDF document text
    • https://vadanuburizupi.weebly.com/uploads/1/3/4/9/134901301/gatukupojemogupixezi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0C 5256 bytes
SHA-256: 9183b730613bfe69e8ca9f7e4cb46731deba3a5015cec036d32a8c2573d0b04e
font_01_sfnt_off0000f011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 7152 bytes
SHA-256: 1ae9bb64572b6d45d25860423d43886b1d55488c2350bbdd1807ae926817a1fa
font_02_sfnt_off00010786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 10864 bytes
SHA-256: 1f0f310bf9f2964cb7ef8bd8adddcebbe8d0258dc8fdb26a826270599bf29602

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