Malicious PDF — malware analysis report

Static analysis result for SHA-256 573ec40cb1c2cfe6…

MALICIOUS

PDF

53.3 KB Created: 2020-03-22 09:07:08 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0898798e107da69c38b14eb7dc8c0efc SHA-1: fac42dbe96076222e0bf0c81a1d4664c7b3fec29 SHA-256: 573ec40cb1c2cfe636188aa35613dae0efadc39194343f8d2b0e480a58c48820
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, pointing to various domains. This technique is often used for SEO spam or to distribute malicious payloads. The ML classifier strongly indicated maliciousness, and the presence of numerous external URLs supports this assessment. No scripts were extracted, limiting the analysis of direct payload delivery mechanisms.

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://crazeehost.com/uploads/1/3/0/7/130740590/130740590.html#six+sigma+statistical+process+control+techniques
    • http://gogocake.com/uploads/1/3/0/4/130476412/aad0c717b6.pdf
    • http://andrewcarlosarchitect.com/uploads/1/3/0/8/130874079/subin.pdf
    • http://hostmaster.thestitchedbird.co.uk/uploads/1/3/0/8/130873867/lexanuri-fewiriw.pdf
    • http://www.mikescottthomson.com/uploads/1/3/0/3/130379133/0892e1bce1c3a56.pdf
    • http://jvwritingv3.club/uploads/1/3/0/4/130483809/waxazutikuxa.pdf
    • http://mixandmatchcoathangers.com/uploads/1/3/0/6/130604519/4444785.pdf
    • http://www.monkeyrocket.co.uk/uploads/1/3/0/5/130539105/5829789.pdf
    • http://musclemorph.net/uploads/1/3/0/6/130639885/wufediwukodenut.pdf
    • http://autodiscover.cpnm.ca/uploads/1/3/0/3/130323761/vuxovifakivamojom.pdf
    • http://achievewellnesscenter.org/uploads/1/3/0/2/130287972/24b08a5.pdf
    • http://magnumaceflooring.com/uploads/1/3/0/4/130483631/5862595.pdf
    • http://mta-sts.mx.sarexplorer.com/uploads/1/3/0/6/130604605/4638439.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008dbe.bin
b345240da346b0080d52948803c3022501070dc71b37c2f5532cc116dd461ff6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DBE 9592 bytes
font_01_sfnt_off0000b157.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB157 16036 bytes

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