Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4c4d328a00bd04…

MALICIOUS

PDF

36.4 KB Created: 2020-04-15 06:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 16964cd8dae686b3fb13717fdedabce7 SHA-1: 27d3e0182891ea8be7c08e01f98b491625d7ba24 SHA-256: 3b4c4d328a00bd0405d0e84dc9bf6149edbf2cb9cee34787d87dd0b815a54405
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM'. The primary URL, http://asociacionperiodistaspr.org/uploads/1/3/1/4/131454120/131454120.html#bias+fx+2+android, is embedded within the document body. This suggests a malicious intent to redirect users to potentially harmful content or to manipulate search engine rankings. The ML classifier strongly supports the malicious verdict.

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://asociacionperiodistaspr.org/uploads/1/3/1/4/131454120/131454120.html#bias+fx+2+android
    • http://taylorturf.com/uploads/1/3/0/6/130603944/nekawafemajazuxodof.pdf
    • http://anindependentdelta.com/uploads/1/3/1/4/131406077/kotalumamafot_guxabarum_mapoxof_tulin.pdf
    • http://alaskanorthernlightviewing.com/uploads/1/3/0/4/130477085/penuva_fubobunumegegug_lariraro.pdf
    • http://hanstelvave.com/uploads/1/3/0/5/130551000/xujibesop.pdf
    • http://laurenyoungforboe.com/uploads/1/3/0/2/130287992/lawewa_rireduwibejof_zerenivuxan.pdf
    • http://heirspedromarialisadolores.com/uploads/1/3/0/5/130590224/zulixomapade-fogulo-binipedaj-kaxem.pdf
    • http://lamezbeauty.com/uploads/1/3/1/4/131453374/sivexirava-kepozitudewoga.pdf
    • http://birthdaypartyraleigh.com/uploads/1/3/0/9/130969539/5908884.pdf
    • http://thehimalayanhope.org/uploads/1/3/0/7/130776889/6316478.pdf
    • http://eneduerabe.org/uploads/1/3/1/4/131438353/4b77e.pdf
    • http://goldenstatecounseling.org/uploads/1/3/0/6/130604054/vubexas-karupev-zerizupos-wewexaluwar.pdf
    • http://relevantageing.com/uploads/1/3/0/2/130289755/wepikawipu.pdf
    • http://goldenstatecounseling.org/uploads/1/3/0/6/130604054
    • 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_off000066ed.bin
c8ce72fd3d83722a2bbdb92e1081bdcadb26dee5cccc439b404459c38aa17cc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66ED 7960 bytes

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