Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbc99a638d36fcb…

MALICIOUS

PDF

38.7 KB Created: 2020-04-05 08:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 32259dcfe86b3df24077af87dcadef0c SHA-1: b2100ca29c3d897b5d8c1ac56bd1484f9a9462fe SHA-256: 9cbc99a638d36fcb6b69e58dcf7f0592d128236e80cce972034c44790d27f72b
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to a multitude of other PDF files hosted on various domains, potentially leading to further compromise or unwanted content.

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://124millerway.com/uploads/1/3/0/5/130551836/130551836.html#ensayo+sobre+taller+de+lectura+y+redaccion
    • http://royaledirect.com/uploads/1/3/0/5/130542863/jenosunugevirokip.pdf
    • http://hypnobirthmelbourne.net/uploads/1/3/0/7/130739121/kaxovixep_xevexomurofo.pdf
    • http://olacannabis.com/uploads/1/3/0/7/130775025/2333563.pdf
    • http://easycookingschool.com/uploads/1/3/0/4/130475959/52978.pdf
    • http://120ebaltimore.com/uploads/1/3/1/0/131071114/porifevamogow.pdf
    • http://yesfoundersfoundation.org/uploads/1/3/0/6/130603756/bf640fc79e5.pdf
    • http://ultravioletwelding.com/uploads/1/3/0/9/130969936/b9847db4d6f104.pdf
    • http://escooby.com/uploads/1/3/0/6/130622058/xafad.pdf
    • http://corbettbomb.com/uploads/1/3/0/2/130271041/5305617.pdf
    • http://cowboylogicmusicpoetry.com/uploads/1/3/1/0/131070364/gazelaweji-texaseragijovav-tufilunirafuz-puzodu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006399.bin
2f6af4c8a350d9ef21591309ffbafe35f8a32bb2e7d843c3733ebbf34324dfb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6399 1784 bytes
font_01_sfnt_off00006bba.bin
98242251ab218eaacc5114d0f142fe223d9d87fb027b9ef74592cb7e2a401116		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBA 8964 bytes

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