Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e6db07b66cb010…

MALICIOUS

PDF

38.6 KB Created: 2020-03-10 07:08:32 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e2743deb3a5032ce860934a4d54fa443 SHA-1: 04706d0506dddf57bf6510eb02104f2216fa740c SHA-256: 90e6db07b66cb010f1c108a7f76e94db18b55404ddb94a11b613fe84ca5c5746
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links, many of which are hosted on unrelated domains and appear to be part of a link farm designed to attract traffic. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to 'free spanish worksheets pdf' and the URLs suggest a lure to download further PDF documents, likely to distribute malware.

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://eaglemountainhouse.devsite-1.com/uploads/1/3/0/6/130604732/130604732.html#free+spanish+worksheets+pdf
    • http://roadiesrule.com/uploads/1/3/0/5/130539348/valenoda.pdf
    • http://piq.com.au/uploads/1/3/0/7/130738978/lopijebarizosisute.pdf
    • http://www.francolawncare.com/uploads/1/3/0/5/130588370/jejevitubotogujuwu.pdf
    • http://randyslounge.com/uploads/1/3/0/2/130272484/ribozajoviwulu.pdf
    • http://rockiteventsaz.com/uploads/1/3/0/7/130740252/tivomamewedowe.pdf
    • http://www.let-us-slay.com/uploads/1/3/0/6/130603847/4659d.pdf
    • http://palmandpine.net/uploads/1/3/0/4/130435955/bifesatinoxonuvuw.pdf
    • http://mta-sts.mail.gibbypugs.com/uploads/1/3/0/4/130488414/5778122.pdf
    • http://www.friendssafetyharborlibrary.org/uploads/1/3/0/3/130323407/nobisog.pdf
    • http://coastalplantstudio.com.au/uploads/1/3/0/4/130488829/suzekixaluse.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_off00006d02.bin
5734960041d863ce879be92cdb3442b6d82f18302b3ce436a1e99b689f9fccfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D02 8560 bytes

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