Malicious PDF — malware analysis report

Static analysis result for SHA-256 8520815a999cbd7b…

MALICIOUS

PDF

36.5 KB Created: 2020-04-06 02:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eff76fcee4cc38f83d286c2aacf6df07 SHA-1: df634752a76294c6a889ca123ebadf398d7be674 SHA-256: 8520815a999cbd7b95c3d4376cd72dd84d0ed0de77e0e231a629e591eb35fa29
94 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF documents. The primary URL suggests a lure for reading content online, which is a common tactic for phishing or redirecting users to malicious sites. The ML classifier strongly indicated maliciousness, supporting the interpretation of these links as part of a malicious distribution or redirection scheme.

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://maritime-economics.com/uploads/1/3/0/5/130541574/130541574.html#house+of+night+hunted+read+online+free
    • http://sheriffsshiraz2019.com/uploads/1/3/0/2/130272070/31b0a71.pdf
    • http://caviarcloset.com/uploads/1/3/1/4/131406344/ead1ecf.pdf
    • http://southernlakeshelicopters.com/uploads/1/3/0/6/130604091/fbaf7832ddb8.pdf
    • http://gioventuidente.com/uploads/1/3/0/7/130776402/jobetufadexagipivi.pdf
    • http://stevierice.com/uploads/1/3/0/2/130287965/pezubelakirovixexali.pdf
    • http://omghospitality.org/uploads/1/3/0/6/130621749/3196520.pdf
    • http://abernethycontracting.com/uploads/1/3/0/3/130313468/b8756c2.pdf
    • http://fowlplayni.com/uploads/1/3/0/5/130551625/606237377.pdf
    • http://mountaineerauction.com/uploads/1/3/0/7/130739227/04164a0.pdf
    • http://visitwitteringsonline.com/uploads/1/3/0/6/130639117/6939107.pdf
    • http://jira.clinicalgenomics.com/uploads/1/3/0/2/130271004/8aa51d55.pdf
    • http://tomballcougarhigh.com/uploads/1/3/0/6/130622104/pefakedisaniji-kemuzo-zegoraj.pdf
    • http://happybuddhastudio.com/uploads/1/3/0/7/130739140/dupodimop-mazetam-zatitazub.pdf
    • http://anaiddesigns.com/uploads/1/3/0/7/130740217/jetebededumu.pdf
    • http://solskib.net/uploads/1/3/0/7/130776787/fijomojalirovi-watuz-pevele.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_off0000686c.bin
d5f328ab5737d569d893e31cc00f3dbeae5a7fee566962299e54f7972831bbc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x686C 7156 bytes

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