Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb3ffa609edeea1…

MALICIOUS

PDF

66.2 KB Created: 2021-02-10 20:04:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c9231c74e3bd4595fd4e14a8a8680e6d SHA-1: 966baec532aa7c07eab2c4a87ce0a685641fc3e7 SHA-256: 9cb3ffa609edeea194d56adfa057d3810b7ebd8a8f4389a08973c3a71b8161d2
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain keywords related to media downloads, suggesting a lure for users seeking content. The presence of multiple links on disposable hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=aadat+punjabi+song+mp4+free In PDF document text
    • https://rosanibo.weebly.com/uploads/1/3/4/8/134873488/5682907.pdfIn PDF document text
    • https://linanilutujaro.weebly.com/uploads/1/3/1/4/131453593/wipezigopatixe_tolizeje_nizosuz.pdfIn PDF document text
    • https://pexajutamog.weebly.com/uploads/1/3/4/7/134759810/8964728.pdfIn PDF document text
    • http://padugozerur.22web.org/taxuzulapapefimosejilita.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://regujivabi.rf.gd/kidnapping_stella_imdb_parents_guide.pdfIn PDF document text
    • http://petikagemejol.rf.gd/buffalo_soldier_song.pdfIn PDF document text
    • http://waxobutadarase.rf.gd/chrome_for_32_bit_system.pdfIn PDF document text
    • http://rupevisa.epizy.com/design_thinking_and_agile.pdfIn PDF document text
    • http://gurevome.rf.gd/chemische_formeln_ausgleichen_erklrung.pdfIn PDF document text
    • http://bisavosimirot.rf.gd/tanakibixozamaturunarur.pdfIn PDF document text
    • http://jelemomibupu.rf.gd/4493359054.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000beb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB2 5620 bytes
SHA-256: dfcd2f8b9ba077097ccadab2adb71e6258ebbbe2b3ad0770f0ed60dc475501d8
font_01_sfnt_off0000d1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BB 1792 bytes
SHA-256: d662fc2924951727487c77e612099ba038fb258c8a10c536ec5ec37b23ca7406
font_02_sfnt_off0000da94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA94 9376 bytes
SHA-256: 158292747c01b9068a654ee2c17709d135f49cc5712bb9514e96fc5d0cb36d8b