Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef708488b924c7b…

MALICIOUS

PDF

37.7 KB Created: 2020-03-11 02:56:32 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 60f1b7401c6e25b74de54cb3deca94a0 SHA-1: f83af663f33f5a4f8bb6fec684dc2124fd5c393e SHA-256: 5ef708488b924c7b618a62ef77b99bbb8807f680118148c134ac5be5115664e0
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for job-related phishing. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external links is a common pattern for distributing malicious content or driving traffic to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://officer.mediutopia.com/uploads/1/3/0/4/130435633/130435633.html#how+to+reject+a+job+interview+politely+email+sample
    • http://bunnystravel.com/uploads/1/3/0/4/130493143/9058856.pdf
    • http://www.serrurerie-lemercier-artisan.com/uploads/1/3/0/8/130874379/kozoxirolixam.pdf
    • http://safechildcoalition.net/uploads/1/3/0/6/130640104/a9f97341d.pdf
    • http://izletiposrbiji.net/uploads/1/3/0/2/130288571/lofozikelenumovedowo.pdf
    • http://royalbridalghana.com/uploads/1/3/0/7/130776002/rumafun.pdf
    • http://nicenspice.com/uploads/1/3/0/8/130814672/tusik.pdf
    • http://rorylambie.com/uploads/1/3/0/4/130477039/6b1887e559.pdf
    • http://www.metrosaut.com/uploads/1/3/0/2/130271131/d8e894ee91b.pdf
    • http://babyak.net/uploads/1/3/0/4/130493816/618397.pdf
    • http://omahaventuregroup.org/uploads/1/3/0/2/130272336/35156.pdf
    • http://macteleprompter.net/uploads/1/3/0/7/130739906/logoxafuxudumarobuki.pdf
    • http://jackkenney.com/uploads/1/3/0/7/130739850/532751.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069a7.bin
2a238c006947ab35222912cdfb03ec6e62a4529e60d43feaab2a78bc063fef72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A7 7780 bytes

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