Malicious PDF — malware analysis report

Static analysis result for SHA-256 94971cbd320b18be…

MALICIOUS

PDF

74.0 KB Created: 2021-05-31 06:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7f3ed0bbe3a693a5c190a2a4286dc16 SHA-1: 29242ce0ff68a92df9c8babadf9b31c5533ab5bd SHA-256: 94971cbd320b18be85a93738cf0b34e6ea55bbeb02166c71c82aae16d78a1c87
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=4.04+endocrine+system+matching+worksheet+answers
    • https://ditufanavuj.weebly.com/uploads/1/3/0/7/130738569/5918375.pdf
    • https://tejitopojod.weebly.com/uploads/1/3/4/7/134737109/kikuxipivibilan-wugigidi-fifamox-togatexelage.pdf
    • https://zitudoxe.weebly.com/uploads/1/3/1/4/131437236/dosej.pdf
    • https://kovibokasekur.weebly.com/uploads/1/3/4/8/134880184/19123537d99.pdf
    • https://tanuroxej.weebly.com/uploads/1/3/4/1/134131309/dujijatipupidavok.pdf
    • https://rixodinek.weebly.com/uploads/1/3/5/3/135392020/6fd1212.pdf
    • https://static.s123-cdn-static.com/uploads/4393785/normal_5ff77a3bcb1c3.pdf
    • https://gowapatemik.weebly.com/uploads/1/3/5/3/135319450/8981428.pdf
    • https://cdn-cms.f-static.net/uploads/4384645/normal_602729068324d.pdf
    • https://fadunununi.weebly.com/uploads/1/3/4/7/134747036/pibixupazasuxaxetax.pdf
    • https://zipebamaxotunev.weebly.com/uploads/1/3/2/8/132814247/tuzosemoxur.pdf
    • https://kogemopisita.weebly.com/uploads/1/3/0/7/130776015/ffd273fa84de.pdf
    • https://gatuxarujesij.weebly.com/uploads/1/3/5/2/135296766/4ab01c40.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8a1541df-2010-4ff3-810b-1a735c2b5a27/how_do_you_change_the_time_on_a_garmin_vivofit_jr_2.pdf
    • https://uploads.strikinglycdn.com/files/887f957f-6c39-4fc8-a981-47d8b5b455b6/fatexejeguvoxam.pdf
    • https://uploads.strikinglycdn.com/files/b2d31e49-c6fe-4dca-a075-176ac777fbd4/38165795330.pdf
    • https://uploads.strikinglycdn.com/files/9c2f5a76-2146-4823-a70f-4b6b6d62da97/94806399622.pdf
    • https://uploads.strikinglycdn.com/files/cfe33197-a0e8-4588-b1ee-04df286defbc/mulikewaza.pdf
    • https://uploads.strikinglycdn.com/files/7bf7e14d-17eb-4b68-80cb-c23e7ffab890/articles_worksheets_for_1st_grade_6.pdf
    • https://uploads.strikinglycdn.com/files/0b4c4cdd-f2d0-47bf-8f31-ca656ef323b7/76445507661.pdf
    • https://uploads.strikinglycdn.com/files/152b4f86-eab1-4e78-a09e-79fe0b5f95c6/consejo_escolar_de_participacion_social_hidalgo_2019.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e16f.bin
4a7ec7087bb6c11f558b499b2824c6beea4ed045ba67294b20b1053782261c2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE16F 5744 bytes
font_01_sfnt_off0000f4f9.bin
ee2bb87d32724cffc661f604c10b005ce926b3d7f39ac3e3aa5ea23f7e20cbf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 10360 bytes

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