Malicious PDF — malware analysis report

Static analysis result for SHA-256 f597cbe9aa110ac6…

MALICIOUS

PDF

38.0 KB Created: 2020-03-29 12:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0cb3e3446721a305a86457fd7223a691 SHA-1: e73c858bc443bb1ff858e82febf5d36de9ad4509 SHA-256: f597cbe9aa110ac6c9759de66865efd3299b57876a5ce0aa06db7696b17179e8
94 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links pointing to other PDF files hosted on various domains. This behavior is characteristic of a link farm, often used to manipulate search engine rankings or to distribute malicious payloads. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious link farm.

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://74-123-79-26.mgwnet.com/uploads/1/3/1/3/131383848/131383848.html#imagenes+amor+prohibido+frases
    • http://getbakedpottery.com/uploads/1/3/0/2/130271217/068c49.pdf
    • http://solidrockhomecareassistance.com/uploads/1/3/0/6/130621044/4bdd09390c79.pdf
    • http://thebriankearney.com/uploads/1/3/1/3/131398214/76483721fe7.pdf
    • http://sarahgauthierroy.com/uploads/1/3/1/4/131406879/bupodo.pdf
    • http://clicklabsllc.com/uploads/1/3/0/9/130969179/wipipu.pdf
    • http://knvest.com/uploads/1/3/0/5/130550722/zasejino.pdf
    • http://movimientomexicano2018.org/uploads/1/3/0/5/130542781/9543519ad1.pdf
    • http://thesecretlifeofsugar.com/uploads/1/3/0/6/130621284/1975468.pdf
    • http://rosealert.com/uploads/1/3/0/7/130776239/2418591.pdf
    • http://gofunavi.com/uploads/1/3/0/8/130874431/naleme_zejivijezikufa_fagatif.pdf
    • http://give2ndwa.org/uploads/1/3/0/7/130739049/bf53042e5ea.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_off00006b06.bin
b9c0ae20569444d27889a8e73967b9ea7d87e976be3c3d9ed862009e92f88fcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B06 8424 bytes

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