Malicious PDF — malware analysis report

Static analysis result for SHA-256 674d3583f00c82b1…

MALICIOUS

PDF

29.6 KB Created: 2020-04-22 16:39:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4ea1e770a9ae3412b0221a43b915c761 SHA-1: 9c07b3c38e6e4e086c0bb8eeaca207da9eb21433 SHA-256: 674d3583f00c82b1c291f5e897b56fa6aa4c857bc4b483959b2250dfde6987bf
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links to various domains, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. These links likely serve to manipulate search engine results or redirect users to malicious content, potentially as part of a phishing or SEO spam campaign.

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://dommebentley.com/uploads/1/3/0/6/130604247/130604247.html#jasper+reports+for+java+developers+pdf
    • http://fleetsteamandclean.com/uploads/1/3/1/3/131381480/4a57e1101f287f4.pdf
    • http://plutogirlstudio.com/uploads/1/3/0/6/130621719/f0fd9ec5a.pdf
    • http://belawtx.com/uploads/1/3/0/9/130969855/223a8528afd7.pdf
    • http://freshlo.org/uploads/1/3/1/4/131454057/wenudupowokop.pdf
    • http://deli-sushi.com/uploads/1/3/0/3/130313196/5246423.pdf
    • http://nlreducation.com/uploads/1/3/0/4/130489926/jatutineti.pdf
    • http://redhoneydew.com/uploads/1/3/1/6/131607075/zosuvaru.pdf
    • http://melodyeastman.com/uploads/1/3/0/2/130289524/gudigidakop.pdf
    • http://jennifermonson.com/uploads/1/3/0/7/130738628/depulo.pdf
    • http://sacred-journeys.net/uploads/1/3/0/2/130291874/561b88a05a10.pdf
    • http://bloodforthebloodmoon.com/uploads/1/3/0/6/130621686/ruvog_rogibu_vozes.pdf
    • http://boredles.com/uploads/1/3/0/6/130621801/revide-nofisexofokov-bitibe-tutafopolifebi.pdf
    • http://endlesssteelsolutions.net/uploads/1/3/1/0/131070307/mogifigesaja-rijedokefota-sepegekija.pdf
    • http://beautysleepwithlamella.com/uploads/1/3/1/4/131438427/4912879.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_off00004d9f.bin
cda58dce79486666360ddf69cd1f2e5ee1d36b1d59a9e9925bee1cf3cd20a440		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D9F 7156 bytes

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