Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ddec215d373061…

MALICIOUS

PDF

34.9 KB Created: 2020-04-07 12:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d1c445accc0942c8da4eb66021dcd02c SHA-1: dca068b0d054fc856607b24307f029874956519f SHA-256: 26ddec215d373061f46b4b18d31f1c025900db8ab9c32ee970da37eec09eb8f2
94 Risk Score

Malware Insights

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

The PDF contains numerous external links to other PDFs hosted on various domains, a technique commonly used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic further supports a malicious intent. The document body itself is heavily obfuscated and contains embedded URLs, reinforcing the idea that the primary function is to redirect users to external, potentially harmful, 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://be-construction.net/uploads/1/3/0/7/130775985/130775985.html#a+doll+house+act+2
    • http://bfit247365.com/uploads/1/3/0/5/130550801/wixinilusum.pdf
    • http://shamestack.com/uploads/1/3/0/6/130640198/korat-tuzatufu-mamebuk.pdf
    • http://avhcare.net/uploads/1/3/1/4/131454699/marutupixe.pdf
    • http://cantinhorural.org/uploads/1/3/0/7/130775672/wimamawabelowez-pagijijapaneje-kikizomara.pdf
    • http://thundersnowproductions.com/uploads/1/3/0/4/130483862/3119727.pdf
    • http://youbuyhouses2day.com/uploads/1/3/0/6/130605510/8ebeeb4e8f9.pdf
    • http://haiofenceproductssuck.com/uploads/1/3/0/5/130538866/9137323.pdf
    • http://gli.team/uploads/1/3/0/7/130739240/697504.pdf
    • http://localchelmsfordbuilders.com/uploads/1/3/0/5/130551832/nunofebus.pdf
    • http://speechertimes.org/uploads/1/3/0/5/130547659/380010.pdf
    • http://piranhatrends.net/uploads/1/3/1/4/131437444/danabexikat-nezajabiwis.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_off00006466.bin
b5fa6e98cdbb6b4b615e7bc0e94c047b548e48e84a14b6c190647a77f51ae6f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6466 6704 bytes

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