Malicious PDF — malware analysis report

Static analysis result for SHA-256 615408d99b067adf…

MALICIOUS

PDF

36.8 KB Created: 2020-03-08 05:00:14 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e6b945a9fb213b33df9fe43e44434382 SHA-1: 87c2f320bafa5cb16aa14f089da3482158e176c8 SHA-256: 615408d99b067adf83c43be9ef92e640870f958aa7976205f890582fc3adc728
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF document contains a large number of external links to other PDF files hosted across various domains. This behavior is indicative of a link farm or a method to distribute additional malicious content or engage in SEO manipulation. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of malicious intent.

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://app-pof.com/uploads/1/3/1/0/131070457/131070457.html#3d+shapes+worksheets+pdf+kindergarten
    • http://courageblogs.com/uploads/1/3/0/6/130604191/zonojupojil.pdf
    • http://mitchellstreetbusinesssuites.com/uploads/1/3/0/7/130738798/5983338.pdf
    • http://chinese.genderinsanity.com/uploads/1/3/0/4/130477702/7763111.pdf
    • http://bethelamechurchluling.com/uploads/1/3/0/6/130605115/5ef19f6233f2.pdf
    • http://medder.store/uploads/1/3/0/4/130476075/xetedo.pdf
    • http://thehockeydennl.com/uploads/1/3/0/5/130589219/fef432.pdf
    • http://thepetsreport.com/uploads/1/3/0/2/130289734/8828367.pdf
    • http://www.ryangetsaring.com/uploads/1/3/0/2/130291827/4873183.pdf
    • http://haroldhopkinson.com/uploads/1/3/0/5/130550817/b4a23058373ad1.pdf
    • http://www.luostarituote.fi/uploads/1/3/0/5/130551046/6158384.pdf
    • http://artistfilmseries.com/uploads/1/3/0/2/130271243/6011789.pdf
    • http://itsnotjustarthritis.info/uploads/1/3/0/5/130551483/8830433.pdf
    • http://tutorloft.com/uploads/1/3/0/4/130476523/7336951.pdf
    • http://subtleapplications.com/uploads/1/3/0/6/130603904/jasuxanix-nobifofimojubo-ganadesak-waterobekil.pdf
    • http://gregorystructuralservices.net/uploads/1/3/0/6/130622093/norolupigux.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_off000069c5.bin
77f02065a44372a8bdebdc3399851e4ad3e1f082b737e4425ebc79e4be489321		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69C5 7200 bytes

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