Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b976593824b526c…

MALICIOUS

PDF

42.6 KB Created: 2020-04-02 23:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 146f2da10a0be1b90adc40d7dfcaf1fc SHA-1: 8029101e75b5cde02c6dca5b787ce1d4aacc3557 SHA-256: 5b976593824b526ce8d89df5b279246bde269a21cb639b32e0229ca24963bdff
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains. This pattern is indicative of a link farm or SEO manipulation tactic, potentially used to drive traffic to malicious sites or to host phishing content. The ML classifier strongly supports the malicious nature of this PDF.

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://smilehearthk.com/uploads/1/3/1/4/131453495/131453495.html#elasticidad+de+ingreso+de+la+demanda
    • http://hemphealthapothecary.com/uploads/1/3/0/6/130621373/16c3198c0c3a0b0.pdf
    • http://yourhigherpower.org/uploads/1/3/0/5/130588597/6163844.pdf
    • http://movingmedicineali.com/uploads/1/3/0/5/130588343/vavilefosaw_kejuninakab.pdf
    • http://beyondtrainingmt.com/uploads/1/3/0/4/130489776/timoguzof.pdf
    • http://jboogies.org/uploads/1/3/0/6/130620956/ce2fc0.pdf
    • http://skyloan.us/uploads/1/3/0/3/130313230/5ab873919.pdf
    • http://katie-peoples.com/uploads/1/3/0/7/130739430/xenebivarosurikaro.pdf
    • http://maxkungli.com/uploads/1/3/0/4/130476276/fakebitizo.pdf
    • http://wacosignal.com/uploads/1/3/0/5/130588954/f4ee11c5923756b.pdf
    • http://amurny.com/uploads/1/3/0/5/130550833/tiredujiwolel.pdf
    • http://onelegchallenge.org/uploads/1/3/0/7/130775674/7169208.pdf
    • http://bollespvlibrary.org/uploads/1/3/1/4/131483068/9930256.pdf
    • http://evolutionarycompass.com/uploads/1/3/1/0/131070096/8ff8abd8830e.pdf
    • http://dreamkeytraining.com/uploads/1/3/0/6/130621503/8527768.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000666e.bin
9a8f3e309ae671fa945fba8d3ddaf185216bab0c2e3d8afbc8142f1d64a912e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x666E 8592 bytes
font_01_sfnt_off000085bd.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85BD 16204 bytes

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