Malicious PDF — malware analysis report

Static analysis result for SHA-256 e090a75295723cc8…

MALICIOUS

PDF

35.9 KB Created: 2020-03-20 05:09:28 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2b62bbfcd9567e9cc9170b49fdde4ffe SHA-1: 1751bc623a3a195ceac624a5be0e8b5cbbbd2beb SHA-256: e090a75295723cc86f8e2319177190c5bfab8abbe9a0ffc4107d2e7fbfab93d7
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used in SEO link farms to manipulate search engine rankings or distribute malicious content. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains text related to accounting and mentions 'wkhtmltopdf', suggesting it was generated programmatically. The primary attack pattern involves redirecting users through a network of linked PDFs hosted on various domains.

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://avabaycompany.com/uploads/1/3/1/0/131071019/131071019.html#definicion+de+inventarios+perpetuos+en+contabilidad
    • http://mymoneybuilder.com/uploads/1/3/0/2/130272629/7182299.pdf
    • http://bibbitybobbityballoons.com/uploads/1/3/1/0/131070678/9514016.pdf
    • http://connectedcommunicationsconsultants.com/uploads/1/3/1/0/131070590/notamatob.pdf
    • http://cartegrisexpress.net/uploads/1/3/0/5/130551477/804428f1101b.pdf
    • http://www.redoptionmusic.ca/uploads/1/3/0/7/130775920/tuwetijez-mujalebaxilasub.pdf
    • http://mycpfc.net/uploads/1/3/0/7/130739491/8f68f9.pdf
    • http://newtribes.org/uploads/1/3/0/7/130740082/fa081.pdf
    • http://barclaysme.com/uploads/1/3/0/6/130603773/vegojajid_gejipujil_gejot_petutebude.pdf
    • http://agbumdsalumni.org/uploads/1/3/0/6/130621176/togij.pdf
    • http://www.colettehill.info/uploads/1/3/0/8/130874277/ludamejurekevadux.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_off0000652b.bin
b614c811b178372a149a68fcd8c151f7b136c46372add19a13e63b929997f411		 pdf-font-stream PDF embedded font (sfnt) at offset 0x652B 8068 bytes

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