Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a98d3c79ebacb4…

MALICIOUS

PDF

37.2 KB Created: 2020-04-04 06:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2b463b75d4462b737445613ba3c1ee14 SHA-1: 385d1b58e8549a37da0c8e472dcb62e98bd0d6f6 SHA-256: f1a98d3c79ebacb44fc17942c6353e38044e2aa29d5b350ae9589d2503dfba64
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged as malicious by an ML classifier and contains a significant number of external links, characteristic of a link farm. The document body, though partially corrupted, contains a URL that points to a similarly structured PDF file. This suggests the primary function is to redirect users to other malicious PDF documents hosted on various domains, likely for SEO poisoning or malware distribution.

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://toonfreakstreasures.com/uploads/1/3/0/9/130969973/130969973.html#en+que+consiste+el+mantenimiento+correctivo+de+software
    • http://prominenceinjax.com/uploads/1/3/1/3/131378796/5daca9dfe21de.pdf
    • http://getprotected.me/uploads/1/3/1/3/131378943/226a1a9fdd4.pdf
    • http://vintagehomecharleston.com/uploads/1/3/0/4/130493037/2139379.pdf
    • http://technicolordesign.net/uploads/1/3/0/6/130605001/3348463.pdf
    • http://morethansoulfood.com/uploads/1/3/0/7/130739371/924657f544b.pdf
    • http://myfoodlogic.com/uploads/1/3/0/5/130544539/dosojajinobiw.pdf
    • http://ticklefa.com/uploads/1/3/0/4/130483417/2412119.pdf
    • http://reesedesigns.net/uploads/1/3/1/4/131453005/5594178.pdf
    • http://foxspring.org/uploads/1/3/1/0/131069859/wexalefakawamo-vukusogar-gupomobelox.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_off000068d5.bin
68416240cb0d07a97b9fd0ba82ecff589fb2cc7e306cbb6e7441fe1cbb86ac08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D5 8372 bytes

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