Malicious PDF — malware analysis report

Static analysis result for SHA-256 985238057a880a40…

MALICIOUS

PDF

49.2 KB Created: 2020-04-07 10:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2b3c1d9f91343a990b43abf9c8f32dd7 SHA-1: 39cc29c5cb8a8246e60ba6bc9263426ca643a150 SHA-256: 985238057a880a40ff119f3580752afd73c7502303c92ebe5b61c96185cb4e06
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, a technique often used for SEO manipulation or to distribute malicious payloads. The document body suggests a lure related to construction project calendars, but the primary malicious activity appears to be the extensive link farm hosted on multiple domains. The ML classifier strongly indicated maliciousness, supporting the presence of these suspicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://insightin2music.com/uploads/1/3/0/5/130543057/130543057.html#ejemplo+de+calendario+de+obra+casa+habitacion
    • http://integradesigninc.com/uploads/1/3/0/2/130289640/de8b79a1c7.pdf
    • http://aduret.com/uploads/1/3/0/8/130813787/9302576.pdf
    • http://lovinmycurlz.com/uploads/1/3/0/2/130288359/tafejabu.pdf
    • http://westerradevelopments.com/uploads/1/3/0/8/130874025/vipobeb_dutafug.pdf
    • http://ericjordanart.com/uploads/1/3/0/4/130479044/deroxed.pdf
    • http://zainabphotography.com/uploads/1/3/0/9/130969682/dapem_jedokawo_mamidatutudek_wujosafi.pdf
    • http://spiritfednutrition.com/uploads/1/3/0/8/130873976/7bcfd.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076c3.bin
7d064ce956fcbd31d2a8f0325db77da4938843c50e8ea7da1e084a12a2cc27dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76C3 9772 bytes
font_01_sfnt_off00009977.bin
87fd6b1a35a64f5c2d30902eea89631a9c05d6b36ef70c6d0cee4d2ad867525e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9977 2596 bytes
font_02_sfnt_off0000a295.bin
6ce32c7926c6f21db5640dc1790b79ec78d1dba01d796f7b775dba7caf5b1ad9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA295 16076 bytes

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