Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d8e7a601f492e0…

MALICIOUS

PDF

123.9 KB Created: 2020-06-07 03:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cbe2aaf0bd8f9ebde2338db322a2610 SHA-1: 2a7b9161aa8ea530537fadd1b70ddc34272d50da SHA-256: 09d8e7a601f492e064258db68596409df89ea44ad7946bc0453db6fbd1d98fbc
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs hosted on similar domains, suggesting a link farm or redirection mechanism. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to decrypt an archive, a common tactic to evade static analysis. While no scripts were explicitly extracted, the PDF structure and extensive link farm are indicative of malicious intent, likely to lead the user to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://unrulypr.com/uploads/1/3/1/6/131606537/131606537.html#fundamentos+de+quimica+hein+arena+pd
    • http://2fey9h.salon225.com/uploads/1/3/1/0/131069940/1463945.pdf
    • http://conexaoeu.com/uploads/1/3/1/4/131452876/6304165.pdf
    • http://taylorleefit.net/uploads/1/3/0/9/130969808/fb6b4e8.pdf
    • http://aikentaxitransport.com/uploads/1/3/1/4/131406802/rexol.pdf
    • http://pettylive.com/uploads/1/3/0/3/130313783/ganavij.pdf
    • http://server.zahnd-schreinerei.ch/uploads/1/3/0/6/130620618/d6f2c4.pdf
    • http://sapphiremaidcleaningservice.com/uploads/1/3/1/3/131380868/2515815.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bomovekuj340683747.files.wordpress.com/2020/06/20080882542.pdf
    • https://pegizibi.files.wordpress.com/2020/06/refizo.pdf
    • https://zawitij.files.wordpress.com/2020/06/5706388350.pdf
    • https://xosujitotodi.files.wordpress.com/2020/06/66653057948.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b84c.bin
ed16025c3105724fe479fdf0b53fbb4b873f5f4c931e97a277caa0bcfe1b4bc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B84C 13500 bytes

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