Malicious PDF — malware analysis report

Static analysis result for SHA-256 617a09775d537eff…

MALICIOUS

PDF

41.3 KB Created: 2020-09-30 00:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4ca5b7974bc9239d71a1b409219b451d SHA-1: eb6bf85b4449c00ec932bf3516d941420963b62f SHA-256: 617a09775d537effb38489d72456e2652adaea7ad0b73dade6c37b6838f2300a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links designed to redirect users to malicious websites, including a known malicious redirector. The document body, though obfuscated, suggests a lure related to a 'Tesda assessment form'. The presence of multiple links on disposable hosting further indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://cctraff.ru/strik?keyword=tesda+assessment+form+pdf In PDF document text
    • https://site-1036728.mozfiles.com/files/1036728/xakekirusaketube.pdfIn PDF document text
    • https://site-1036630.mozfiles.com/files/1036630/96707804429.pdfIn PDF document text
    • https://site-1036744.mozfiles.com/files/1036744/76423553825.pdfIn PDF document text
    • https://site-1037022.mozfiles.com/files/1037022/xajanudenosurogokufojiku.pdfIn PDF document text
    • http://files.colabsunnylin.com/uploads/1/3/2/6/132681824/9969650.pdfIn PDF document text
    • http://nagomedix.alisonjepsonoboe.com/uploads/1/3/0/7/130739456/tepixevumofal-lapamito-momele-fuzogug.pdfIn PDF document text
    • http://bafamenas.flexusdanceco.org/uploads/1/3/0/8/130873987/8732968.pdfIn PDF document text
    • http://files.wisconsinrailroadbooks.com/uploads/1/3/1/3/131381067/renebet.pdfIn PDF document text
    • https://site-1036767.mozfiles.com/files/1036767/sekamuminilavi.pdfIn PDF document text
    • https://site-1037166.mozfiles.com/files/1037166/wopopubamimodatu.pdfIn PDF document text
    • https://site-1037152.mozfiles.com/files/1037152/wujepukizukipemad.pdfIn PDF document text
    • https://site-1036907.mozfiles.com/files/1036907/62477567445.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1732abe-f9c5-46f8-b52d-54bafd00e642/nebitate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32a96cb1-1fc7-4815-8954-add725a0bf5f/95399198313.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58E6 5104 bytes
SHA-256: a870a5229340c1ed3507c449f350e609ffd986b447a930236660666d7e0cd597
font_01_sfnt_off00006a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A28 15272 bytes
SHA-256: 0aea11f0e5716124373e97e8a53553237027c9d50c60e9c18373b8eb9ec19792

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